feat: add rake, bankroll management, seat randomization, FlockBot & ChumpBot

- Add RakeConfig with percentage-based rake and per-pot cap
- Add bankroll tracking (reset per hand or auto-refill threshold)
- Add seat randomization with seeded RNG for reproducibility
- Add FlockBot (tight-aggressive) and ChumpBot (loose-passive) bots
- Refactor HandRunner: extract finalize_result, compute_chip_movements, credit_winnings
- Add num_raises to GameInfo for authoritative raise counting
- Record SB/BB as Raise actions (Meerkat convention)
- Update all existing bot tests for new GameInfo fields
- Add ARCHITECTURE_RAKE_BANKROLL_SEATS.md documentation

docs/ARCHITECTURE_RAKE_BANKROLL_SEATS.md

@@ -0,0 +1,786 @@
+# Architecture: Rake, Bankroll Management & Randomized Seats
+
+## Overview
+
+This document describes the architecture for three new features in the `holdem_core` poker engine:
+
+1. **Rake** — Configurable percentage deducted from pots at showdown
+2. **Bankroll Management** — Per-hand stack reset and automatic short-stack refill
+3. **Randomized Seats** — Shuffle player seat assignments before each hand or tournament
+
+All three features are backward-compatible: existing TOML configs without these fields continue to work with sensible defaults (no rake, no reset, no refill, no randomization).
+
+---
+
+## Feature 1: Rake
+
+### 1.1 Config Changes
+
+Add two fields to [`GameConfig`](holdem_core/src/game/config.rs:178):
+
+```rust
+// In GameConfig struct:
+
+/// Rake percentage taken from each pot at showdown (e.g., 0.05 = 5%).
+/// Rake is deducted proportionally from each pot (main + side pots).
+/// Set to 0.0 (default) to disable rake.
+#[serde(default)]
+pub rake_percentage: f64,
+
+/// Maximum rake in chips per pot. 0 means no cap.
+#[serde(default)]
+pub rake_cap: ChipCount,
+```
+
+**Defaults**: `rake_percentage: 0.0`, `rake_cap: 0` (no rake, no cap). Since both use `#[serde(default)]`, existing TOML files without these fields deserialize correctly.
+
+**Validation**: Add a validation method or `#[serde(deserialize_with = ...)]` that ensures `rake_percentage` is in `[0.0, 1.0]`.
+
+### 1.2 Data Model Changes
+
+#### New struct: `RakeConfig`
+
+```rust
+/// Runtime rake configuration, derived from GameConfig.
+#[derive(Debug, Clone, Copy)]
+pub struct RakeConfig {
+    /// Fraction of each pot taken as rake (e.g., 0.05).
+    pub percentage: f64,
+    /// Maximum rake per pot in chips; 0 = uncapped.
+    pub cap: ChipCount,
+}
+
+impl RakeConfig {
+    pub fn no_rake() -> Self {
+        Self { percentage: 0.0, cap: 0 }
+    }
+
+    /// Returns true if rake is effectively disabled.
+    pub fn is_zero(&self) -> bool {
+        self.percentage == 0.0
+    }
+
+    /// Calculate rake for a pot of the given size.
+    /// Returns the rake amount (floored to whole chips).
+    pub fn calculate_rake(&self, pot_amount: ChipCount) -> ChipCount {
+        if self.percentage == 0.0 || pot_amount == 0 {
+            return 0;
+        }
+        let rake = (pot_amount as f64 * self.percentage).floor() as ChipCount;
+        if self.cap > 0 {
+            rake.min(self.cap)
+        } else {
+            rake
+        }
+    }
+}
+```
+
+#### Changes to `HandResult`
+
+Add a field to [`HandResult`](holdem_core/src/game/hand_runner.rs:86):
+
+```rust
+pub struct HandResult {
+    pub pot_winners: Vec<Vec<PotWinner>>,
+    pub hand_values: HashMap<PlayerId, HandValue>,
+    pub board: Board,
+    pub chip_movements: HashMap<PlayerId, i64>,
+    /// Total rake deducted from all pots this hand.
+    pub total_rake: ChipCount,
+    /// Rake deducted per pot, parallel to pot_winners.
+    pub rake_per_pot: Vec<ChipCount>,
+}
+```
+
+### 1.3 Behavior Flow
+
+The rake is applied **after** [`PotManager::distribute()`](holdem_core/src/game/pot.rs:180) returns its results, but **before** chip movements are calculated and stacks are credited. This keeps the pot manager's core logic clean and testable.
+
+```mermaid
+flowchart TD
+    A[pot_manager.distribute - hand_values] --> B[For each pot: calculate rake]
+    B --> C[For each winner in pot: reduce award by proportional rake]
+    C --> D[Accumulate total_rake and rake_per_pot]
+    D --> E[Calculate chip_movements with raked amounts]
+    E --> F[Credit raked winnings to stacks]
+    F --> G[Build HandResult with rake info]
+```
+
+**Hook point**: Both [`HandRunner::showdown()`](holdem_core/src/game/hand_runner.rs:543) and [`HandRunner::resolve_last_player_wins()`](holdem_core/src/game/hand_runner.rs:664) need rake logic. The cleanest approach is:
+
+1. Add `rake_config: RakeConfig` field to [`HandRunner`](holdem_core/src/game/hand_runner.rs:100)
+2. Create a private helper method:
+
+```rust
+impl HandRunner {
+    /// Apply rake to pot distribution results.
+    /// Returns (raked_pot_winners, rake_per_pot, total_rake).
+    fn apply_rake(
+        &self,
+        pot_winners: Vec<Vec<PotWinner>>,
+    ) -> (Vec<Vec<PotWinner>>, Vec<ChipCount>, ChipCount) {
+        if self.rake_config.is_zero() {
+            let total: ChipCount = 0;
+            let per_pot = vec![0; pot_winners.len()];
+            return (pot_winners, per_pot, total);
+        }
+
+        let mut total_rake: ChipCount = 0;
+        let mut rake_per_pot = Vec::with_capacity(pot_winners.len());
+
+        let raked_winners: Vec<Vec<PotWinner>> = pot_winners
+            .into_iter()
+            .map(|mut pot_result| {
+                // Sum the pot from winner amounts (they haven't been raked yet).
+                let pot_total: ChipCount = pot_result.iter().map(|w| w.amount).sum();
+                let rake = self.rake_config.calculate_rake(pot_total);
+                rake_per_pot.push(rake);
+                total_rake += rake;
+
+                // Deduct rake proportionally from each winner.
+                if rake == 0 || pot_result.is_empty() {
+                    return pot_result;
+                }
+
+                let num_winners = pot_result.len() as ChipCount;
+                let rake_per_winner = rake / num_winners;
+                let rake_remainder = rake % num_winners;
+
+                for (i, winner) in pot_result.iter_mut().enumerate() {
+                    let extra = if (i as ChipCount) < rake_remainder { 1 } else { 0 };
+                    winner.amount = winner.amount.saturating_sub(rake_per_winner + extra);
+                }
+                pot_result
+            })
+            .collect();
+
+        (raked_winners, rake_per_pot, total_rake)
+    }
+}
+```
+
+3. In [`showdown()`](holdem_core/src/game/hand_runner.rs:611), after line 611 (`let pot_winners = self.pot_manager.distribute(&hand_values);`), call `apply_rake()` before computing chip movements.
+
+4. In [`resolve_last_player_wins()`](holdem_core/src/game/hand_runner.rs:677), same pattern after line 677.
+
+5. Pass `RakeConfig` through [`HandRunner::new()`](holdem_core/src/game/hand_runner.rs:155) — add it as a parameter.
+
+6. Thread `RakeConfig` from [`GameConfig`](holdem_core/src/game/config.rs:178) → [`Table`](holdem_core/src/game/table.rs:64) → [`HandRunner`](holdem_core/src/game/hand_runner.rs:100):
+   - Add `rake_config: RakeConfig` to [`TableConfig`](holdem_core/src/game/table.rs:29)
+   - Store it in [`Table`](holdem_core/src/game/table.rs:64)
+   - Pass it when constructing `HandRunner` in [`Table::start_hand()`](holdem_core/src/game/table.rs:322)
+
+### 1.4 Stats Impact
+
+Add to [`PlayerStats`](holdem_core/src/game/stats.rs:20):
+
+```rust
+/// Total rake paid by this player across all hands.
+/// Rake is attributed proportionally based on the player's contribution to each pot.
+pub total_rake_paid: ChipCount,
+```
+
+Add to [`SimulationStats`](holdem_core/src/game/stats.rs:92):
+
+```rust
+/// Total rake collected across the entire simulation.
+pub total_rake: ChipCount,
+```
+
+Update [`SimulationStats::record_hand_result()`](holdem_core/src/game/stats.rs:120) to accumulate `total_rake` from `result.total_rake`.
+
+**Rake attribution**: To attribute rake to individual players, we need to know each player's contribution to each pot. The `PotManager` already tracks this via `wagers`. We can add a method to compute per-player rake:
+
+```rust
+impl PotManager {
+    /// Returns each player's contribution to each finalized pot.
+    /// Useful for proportional rake attribution.
+    pub fn player_pot_contributions(&self) -> Vec<HashMap<PlayerId, ChipCount>> {
+        // For each pot, compute what each player contributed
+        // based on the side pot algorithm thresholds
+    }
+}
+```
+
+Alternatively, a simpler approach: track rake only at the simulation level (total_rake) and don't attribute per-player. This is simpler and sufficient for most use cases. Per-player rake attribution can be added later.
+
+### 1.5 Edge Cases
+
+| Scenario | Behavior |
+|----------|----------|
+| Pot of 0 chips | Rake = 0 (guard in `calculate_rake`) |
+| Rake > winner's share | Use `saturating_sub` — winner gets 0, rake is capped at pot total |
+| Split pot with uneven shares | Remainder rake chips distributed round-robin to winners in order |
+| No showdown (all fold) | **Rake still applies** — the winner's pot is raked |
+| Rake cap reached | `rake.min(self.cap)` applied per pot |
+| Multiple side pots | Rake calculated independently per pot |
+
+### 1.6 TOML Config Example
+
+```toml
+[game]
+game_type = "Cash"
+num_seats = 6
+small_blind = 10
+big_blind = 20
+starting_chips = 10000
+num_hands = 1000
+rake_percentage = 0.05    # 5% rake
+rake_cap = 50             # Max 50 chips rake per pot
+
+[game.bet_limit]
+type = "no_limit"
+min_raise = 20
+```
+
+---
+
+## Feature 2: Bankroll Management
+
+### 2.1 Config Changes
+
+Add two fields to [`GameConfig`](holdem_core/src/game/config.rs:178):
+
+```rust
+/// If true, all players' stacks are reset to `starting_chips` before every hand.
+/// Their overall profit/loss balance is tracked separately via `bankroll`.
+#[serde(default)]
+pub reset_bankroll_each_hand: bool,
+
+/// When a player's stack drops to or below this threshold (and reset is NOT enabled),
+/// they automatically buy back up to `starting_chips`. Their overall balance
+/// decreases by the buy-in amount.
+#[serde(default)]
+pub bankroll_refill_threshold: ChipCount,
+```
+
+**Defaults**: `reset_bankroll_each_hand: false`, `bankroll_refill_threshold: 0` (disabled). Both use `#[serde(default)]` for backward compatibility.
+
+### 2.2 Data Model Changes
+
+#### New field on `Seat`
+
+Add a `bankroll` field to [`Seat`](holdem_core/src/game/player.rs:268):
+
+```rust
+pub struct Seat {
+    // ... existing fields ...
+
+    /// The player's overall balance (profit/loss) across all hands.
+    /// Starts at 0. Increases when the player wins, decreases when they lose.
+    /// When reset_bankroll_each_hand is enabled, this tracks the cumulative
+    /// profit/loss while the stack is reset each hand.
+    /// When bankroll_refill_threshold triggers a reload, the buy-in amount
+    /// is deducted from bankroll.
+    pub bankroll: i64,
+}
+```
+
+Update [`Seat::new()`](holdem_core/src/game/player.rs:331) to initialize `bankroll: 0`.
+
+#### Changes to `Table`
+
+Add bankroll config fields to [`Table`](holdem_core/src/game/table.rs:64):
+
+```rust
+pub struct Table {
+    // ... existing fields ...
+
+    /// If true, reset all stacks to starting_chips before each hand.
+    reset_bankroll_each_hand: bool,
+
+    /// Auto-refill threshold. 0 = disabled.
+    bankroll_refill_threshold: ChipCount,
+
+    /// Starting chips (for resets and refills).
+    starting_chips: ChipCount,
+}
+```
+
+Add these to [`TableConfig`](holdem_core/src/game/table.rs:29) as well so they flow from config:
+
+```rust
+pub struct TableConfig {
+    // ... existing fields ...
+    pub reset_bankroll_each_hand: bool,
+    pub bankroll_refill_threshold: ChipCount,
+    pub starting_chips: ChipCount,
+}
+```
+
+#### Changes to `PlayerInfo`
+
+Add to [`PlayerInfo`](holdem_core/src/game/player_info.rs:35):
+
+```rust
+/// The player's overall bankroll balance across all hands.
+/// Positive = profit, negative = loss.
+pub bankroll: i64,
+```
+
+#### Changes to `GameInfo`
+
+Add to [`GameInfo`](holdem_core/src/game/game_info.rs:21):
+
+```rust
+/// Whether bankroll reset mode is enabled.
+pub reset_bankroll_each_hand: bool,
+```
+
+### 2.3 Behavior Flow
+
+#### Reset Mode (`reset_bankroll_each_hand = true`)
+
+```mermaid
+flowchart TD
+    A[Before start_hand] --> B{reset_bankroll_each_hand?}
+    B -- Yes --> C[For each seated player]
+    C --> D[bankroll += stack as i64 - starting_chips as i64]
+    D --> E[stack = starting_chips]
+    E --> F[state = Active]
+    B -- No --> G{refill_threshold > 0?}
+    G -- Yes --> H[For each seated player]
+    H --> I{stack <= threshold AND state != SittingOut?}
+    I -- Yes --> J[refill_amount = starting_chips - stack]
+    J --> K[bankroll -= refill_amount as i64]
+    K --> L[stack = starting_chips]
+    I -- No --> M[Skip]
+    G -- No --> N[Proceed normally]
+    F --> N
+    L --> N
+    M --> N
+```
+
+**Hook point**: In [`Table::start_hand()`](holdem_core/src/game/table.rs:288), insert the bankroll logic **before** step 3 (advance button). The new step 2.5:
+
+```rust
+// In Table::start_hand(), after the active_count check:
+
+// 2.5. Bankroll management.
+if self.reset_bankroll_each_hand {
+    self.reset_stacks_to_starting();
+} else if self.bankroll_refill_threshold > 0 {
+    self.refill_short_stacks();
+}
+```
+
+New private methods on `Table`:
+
+```rust
+impl Table {
+    /// Reset all seated players' stacks to starting_chips.
+    /// Track the change in their bankroll.
+    fn reset_stacks_to_starting(&mut self) {
+        let starting = self.starting_chips;
+        for slot in &mut self.seats {
+            if let Some(seat) = slot.as_mut() {
+                // The "cost" of resetting is the difference between
+                // starting and current stack.
+                // If they have more than starting, they profit.
+                // If they have less, they lost.
+                seat.bankroll += seat.stack as i64 - starting as i64;
+                seat.stack = starting;
+                // Re-activate sitting-out players (they have chips again).
+                if seat.state == PlayerState::SittingOut {
+                    seat.state = PlayerState::Active;
+                }
+            }
+        }
+    }
+
+    /// Refill short-stacked players up to starting_chips.
+    fn refill_short_stacks(&mut self) {
+        let threshold = self.bankroll_refill_threshold;
+        let starting = self.starting_chips;
+        for slot in &mut self.seats {
+            if let Some(seat) = slot.as_mut() {
+                if seat.state == PlayerState::SittingOut {
+                    continue;
+                }
+                if seat.stack <= threshold {
+                    let refill = starting.saturating_sub(seat.stack);
+                    if refill > 0 {
+                        seat.bankroll -= refill as i64;
+                        seat.stack = starting;
+                    }
+                }
+            }
+        }
+    }
+}
+```
+
+**Important**: When `reset_bankroll_each_hand = true`, busted players (stack = 0, state = SittingOut) are re-activated with a full stack. This means all players play every hand — the simulation tracks their cumulative profit/loss via `bankroll`.
+
+When `bankroll_refill_threshold > 0` (without reset), only players below the threshold get refilled. Busted players (SittingOut) are **not** refilled — they stay out. This matches real poker behavior where a bust-out is different from being short-stacked. If you want busted players to also reload, set `reset_bankroll_each_hand = true` instead.
+
+#### After Hand Completion
+
+In [`Table::complete_hand()`](holdem_core/src/game/table.rs:351), after restoring seats, the bankroll needs to be updated with the hand results. The chip movements from `HandResult` already reflect the net change per hand. However, with `reset_bankroll_each_hand`, the bankroll is updated at the **start** of the next hand (via `reset_stacks_to_starting`), not at the end of the current one. This is simpler and avoids double-counting.
+
+For `bankroll_refill_threshold` mode (without reset), the bankroll is only affected by refill purchases. The stack changes from winning/losing are already reflected in `seat.stack`. The `bankroll` field tracks the additional money spent on refills.
+
+### 2.4 Stats Impact
+
+The existing [`SimulationStats::record_final_stacks()`](holdem_core/src/game/stats.rs:153) computes `total_profit = final_stack - starting_stack`. With bankroll management, this is no longer accurate.
+
+**Solution**: Add `bankroll` tracking to stats:
+
+```rust
+// In PlayerStats:
+/// Total bankroll balance (includes refill costs and reset adjustments).
+pub bankroll: i64,
+```
+
+Update [`SimulationStats::record_final_stacks()`](holdem_core/src/game/stats.rs:153) to also record bankroll:
+
+```rust
+pub fn record_final_stacks(
+    &mut self,
+    stacks: &HashMap<PlayerId, ChipCount>,
+    starting_stacks: &HashMap<PlayerId, ChipCount>,
+    bankrolls: &HashMap<PlayerId, i64>,  // NEW parameter
+) {
+    for (&player_id, &final_stack) in stacks {
+        if let Some(stats) = self.players.get_mut(&player_id) {
+            stats.final_stack = final_stack;
+            let starting = starting_stacks.get(&player_id).copied().unwrap_or(0);
+            stats.bankroll = *bankrolls.get(&player_id).unwrap_or(&0);
+            // With bankroll tracking, total_profit = bankroll
+            // (bankroll already captures all net flows)
+            if stats.bankroll != 0 {
+                stats.total_profit = stats.bankroll;
+            } else {
+                // Fallback for non-bankroll mode
+                stats.total_profit = final_stack as i64 - starting as i64;
+            }
+        }
+    }
+}
+```
+
+In [`run_cash_game()`](holdem_core/src/game/simulation.rs:87), collect bankrolls alongside final stacks:
+
+```rust
+let bankrolls: HashMap<PlayerId, i64> = table
+    .seats()
+    .iter()
+    .filter_map(|slot| {
+        slot.as_ref().map(|seat| (seat.player_id, seat.bankroll))
+    })
+    .collect();
+stats.record_final_stacks(&final_stacks, &starting_stacks, &bankrolls);
+```
+
+### 2.5 Edge Cases
+
+| Scenario | Behavior |
+|----------|----------|
+| Player wins big, stack > starting_chips, reset mode | bankroll increases by the surplus, stack reset to starting_chips |
+| Player busts, reset mode | Re-activated with starting_chips, bankroll decreases by starting_chips |
+| Refill threshold = 0 | No refills (disabled) |
+| Refill threshold >= starting_chips | Refill every hand (unusual but valid) |
+| Both reset and refill enabled | Reset takes precedence (refill is skipped) |
+| Tournament mode | Bankroll management is **cash-game only** — ignored for tournaments |
+| Bankroll goes very negative | `i64` provides ~9 quintillion range — no practical overflow concern |
+
+### 2.6 TOML Config Example
+
+```toml
+# Example: Cash game with bankroll reset (tournament-style tracking)
+[game]
+game_type = "Cash"
+num_seats = 6
+small_blind = 10
+big_blind = 20
+starting_chips = 10000
+num_hands = 1000
+reset_bankroll_each_hand = true
+
+[game.bet_limit]
+type = "no_limit"
+min_raise = 20
+```
+
+```toml
+# Example: Cash game with auto-refill
+[game]
+game_type = "Cash"
+num_seats = 6
+small_blind = 10
+big_blind = 20
+starting_chips = 10000
+num_hands = 1000
+bankroll_refill_threshold = 1000   # Refill when stack <= 1000
+
+[game.bet_limit]
+type = "no_limit"
+min_raise = 20
+```
+
+---
+
+## Feature 3: Randomized Seats
+
+### 3.1 Config Changes
+
+Add one field to [`GameConfig`](holdem_core/src/game/config.rs:178):
+
+```rust
+/// If true, player seat assignments are randomized before each hand
+/// (cash game) or before tournament start.
+#[serde(default)]
+pub randomize_seats: bool,
+```
+
+**Default**: `false`. Uses `#[serde(default)]` for backward compatibility.
+
+### 3.2 Data Model Changes
+
+Add to [`Table`](holdem_core/src/game/table.rs:64):
+
+```rust
+pub struct Table {
+    // ... existing fields ...
+
+    /// If true, shuffle seat assignments before each hand.
+    randomize_seats: bool,
+}
+```
+
+Add to [`TableConfig`](holdem_core/src/game/table.rs:29):
+
+```rust
+pub struct TableConfig {
+    // ... existing fields ...
+    pub randomize_seats: bool,
+}
+```
+
+### 3.3 Behavior Flow
+
+```mermaid
+flowchart TD
+    A[Table::start_hand] --> B{randomize_seats?}
+    B -- Yes --> C[Collect all seated players into a Vec]
+    C --> D[Shuffle the Vec using seeded RNG]
+    D --> E[Clear all seats]
+    E --> F[Re-seat players in shuffled order to positions 0..N]
+    B -- No --> G[Proceed with existing seat assignments]
+    F --> G
+    G --> H[Advance button and continue hand start]
+```
+
+**Hook point**: In [`Table::start_hand()`](holdem_core/src/game/table.rs:288), insert randomization **before** step 3 (advance button) and **after** bankroll management. The new step 2.7:
+
+```rust
+// In Table::start_hand():
+
+// 2.7. Randomize seats if configured.
+if self.randomize_seats {
+    self.shuffle_seats()?;
+}
+```
+
+New method on `Table`:
+
+```rust
+impl Table {
+    /// Randomize seat assignments by collecting all seated players,
+    /// shuffling them, and re-seating at positions 0..N.
+    fn shuffle_seats(&mut self) -> Result<(), GameError> {
+        // 1. Collect all occupied seats.
+        let mut occupied: Vec<Seat> = self
+            .seats
+            .iter_mut()
+            .filter_map(|slot| slot.take())
+            .collect();
+
+        if occupied.len() < 2 {
+            // Put them back.
+            for (i, seat) in occupied.into_iter().enumerate() {
+                self.seats[i] = Some(seat);
+            }
+            return Ok(());
+        }
+
+        // 2. Shuffle using seeded RNG for reproducibility.
+        // Use a seed derived from the table seed + hand number.
+        let rng_seed = self.seed
+            .map(|s| s.wrapping_add(self.hand_number))
+            .unwrap_or_else(|| {
+                // Use a simple hash of hand_number as fallback.
+                self.hand_number
+            });
+        let mut rng = rand::rngs::StdRng::seed_from_u64(rng_seed);
+        use rand::seq::SliceRandom;
+        occupied.shuffle(&mut rng);
+
+        // 3. Clear all seats (already empty from take).
+        // 4. Re-seat at positions 0, 1, 2, ...
+        for (i, mut seat) in occupied.into_iter().enumerate() {
+            seat.index = i as SeatIndex;
+            self.seats[i] = Some(seat);
+        }
+
+        // 5. Reset button to 0 since seat assignments changed.
+        self.button = 0;
+
+        Ok(())
+    }
+}
+```
+
+**For tournaments**: Randomization happens once at tournament start, not per hand. The tournament code in [`tournament.rs`](holdem_core/src/game/tournament.rs) would call a `Table::shuffle_seats()` method during initialization. This is a separate call site but uses the same method.
+
+### 3.4 Stats Impact
+
+No new stats fields needed. Seat randomization is transparent to stats tracking, which uses `PlayerId` (not seat index) as the key.
+
+### 3.5 Edge Cases
+
+| Scenario | Behavior |
+|----------|----------|
+| Only 1 player seated | No shuffle (not enough players) |
+| No seed configured | Use hand_number as a fallback seed |
+| Seed configured | Use `seed + hand_number` for per-hand variation |
+| During a hand | No-op (randomization only happens between hands) |
+| Tournament | Shuffle once at start, not per hand |
+| Button position | Reset to 0 after shuffle to avoid invalid button references |
+
+### 3.6 TOML Config Example
+
+```toml
+[game]
+game_type = "Cash"
+num_seats = 6
+small_blind = 10
+big_blind = 20
+starting_chips = 10000
+num_hands = 1000
+randomize_seats = true
+
+[game.bet_limit]
+type = "no_limit"
+min_raise = 20
+```
+
+---
+
+## Cross-Feature Interactions
+
+### Rake + Bankroll Reset
+
+When both are enabled:
+1. Rake is deducted from pot winnings during the hand (inside `HandRunner`)
+2. Bankroll reset happens between hands (inside `Table`)
+3. The `chip_movements` in `HandResult` already reflect rake deductions
+4. Bankroll tracking picks up the post-rake stack values
+
+The interaction is clean because rake operates **within** a hand and bankroll operates **between** hands.
+
+### Rake + Stats
+
+With rake enabled, `total_profit` across all players will sum to `-(total_rake as i64)` instead of 0. This is correct — the rake is money leaving the system.
+
+### Bankroll Reset + Randomized Seats
+
+Both operate between hands in `Table::start_hand()`. The execution order is:
+
+1. Bankroll management (reset/refill) — step 2.5
+2. Seat randomization — step 2.7
+3. Advance button — step 3
+
+This order ensures bankroll adjustments happen before seats are shuffled.
+
+### All Three Together
+
+```mermaid
+flowchart TD
+    A[Table::start_hand] --> B[Validate: enough players?]
+    B -- No --> ERR[Return NotEnoughPlayers]
+    B -- Yes --> C{reset_bankroll?}
+    C -- Yes --> D[Reset all stacks to starting_chips]
+    C -- No --> E{refill_threshold > 0?}
+    E -- Yes --> F[Refill short stacks]
+    E -- No --> G[Skip]
+    D --> H{randomize_seats?}
+    F --> H
+    G --> H
+    H -- Yes --> I[Shuffle seat assignments]
+    H -- No --> J[Skip]
+    I --> K[Advance button]
+    J --> K
+    K --> L[Collect active seats]
+    L --> M[Create HandRunner with RakeConfig]
+    M --> N[Start hand: post blinds, deal]
+```
+
+---
+
+## Implementation Todo List
+
+The following is the recommended implementation order, broken into independent units:
+
+### Phase 1: Rake
+1. Add `RakeConfig` struct to `pot.rs` (or a new `rake.rs` module)
+2. Add `rake_percentage` and `rake_cap` fields to `GameConfig` with `#[serde(default)]`
+3. Add `RakeConfig::from_game_config()` conversion
+4. Add `rake_config: RakeConfig` to `TableConfig` and `Table`
+5. Add `rake_config: RakeConfig` to `HandRunner`
+6. Implement `HandRunner::apply_rake()` helper method
+7. Update `HandRunner::showdown()` to call `apply_rake()`
+8. Update `HandRunner::resolve_last_player_wins()` to call `apply_rake()`
+9. Add `total_rake` and `rake_per_pot` to `HandResult`
+10. Add `total_rake` to `SimulationStats` and update `record_hand_result()`
+11. Update `GameConfig::to_table_config()` to pass rake config
+12. Add unit tests for `RakeConfig::calculate_rake()`
+13. Add integration tests for raked hands
+
+### Phase 2: Bankroll Management
+1. Add `bankroll: i64` field to `Seat` (default 0)
+2. Add `reset_bankroll_each_hand` and `bankroll_refill_threshold` to `GameConfig`
+3. Add these fields to `TableConfig` and `Table`
+4. Implement `Table::reset_stacks_to_starting()`
+5. Implement `Table::refill_short_stacks()`
+6. Update `Table::start_hand()` to call bankroll management
+7. Add `bankroll: i64` to `PlayerInfo` and update `Seat::to_player_info()`
+8. Add `reset_bankroll_each_hand: bool` to `GameInfo`
+9. Update `SimulationStats::record_final_stacks()` to accept bankrolls
+10. Update `run_cash_game()` to collect bankrolls
+11. Add `bankroll: i64` to `PlayerStats`
+12. Add tests for reset mode, refill mode, and edge cases
+
+### Phase 3: Randomized Seats
+1. Add `randomize_seats: bool` to `GameConfig`, `TableConfig`, and `Table`
+2. Implement `Table::shuffle_seats()` using seeded RNG
+3. Update `Table::start_hand()` to call shuffle when enabled
+4. Ensure `rand` crate is available as a dependency
+5. Add tests for seat randomization with and without seed
+6. Add tournament integration (shuffle at start)
+
+### Phase 4: Cross-Cutting
+1. Update existing TOML config examples with commented-out new fields
+2. Update `GameConfig::default()` to include new fields
+3. Update `SimulationStats::summary()` to display rake and bankroll info
+4. Verify backward compatibility: run existing tests unchanged
+5. Update `docs/` README with new config options
+
+---
+
+## Summary of All Struct Changes
+
+| Struct | File | New Fields |
+|--------|------|------------|
+| `GameConfig` | `config.rs` | `rake_percentage: f64`, `rake_cap: ChipCount`, `reset_bankroll_each_hand: bool`, `bankroll_refill_threshold: ChipCount`, `randomize_seats: bool` |
+| `TableConfig` | `table.rs` | `rake_config: RakeConfig`, `reset_bankroll_each_hand: bool`, `bankroll_refill_threshold: ChipCount`, `starting_chips: ChipCount`, `randomize_seats: bool` |
+| `Table` | `table.rs` | `rake_config: RakeConfig`, `reset_bankroll_each_hand: bool`, `bankroll_refill_threshold: ChipCount`, `starting_chips: ChipCount`, `randomize_seats: bool` |
+| `HandRunner` | `hand_runner.rs` | `rake_config: RakeConfig` |
+| `HandResult` | `hand_runner.rs` | `total_rake: ChipCount`, `rake_per_pot: Vec<ChipCount>` |
+| `Seat` | `player.rs` | `bankroll: i64` |
+| `PlayerInfo` | `player_info.rs` | `bankroll: i64` |
+| `GameInfo` | `game_info.rs` | `reset_bankroll_each_hand: bool` |
+| `PlayerStats` | `stats.rs` | `total_rake_paid: ChipCount`, `bankroll: i64` |
+| `SimulationStats` | `stats.rs` | `total_rake: ChipCount` |
+| `RakeConfig` | NEW | `percentage: f64`, `cap: ChipCount` |

holdem_core/examples/configs/cash_game.toml

@@ -1,24 +1,63 @@
 [game]
 game_type = "Cash"
-num_seats = 6
+num_seats = 10
 small_blind = 10
 big_blind = 20
 ante = 0
-starting_chips = 10000
+starting_chips = 5000
-num_hands = 1000
+num_hands = 10000
+
+# Rake configuration (optional, defaults to no rake).
+# rake_percentage = 0.05    # 5% rake
+# rake_cap = 50             # Max 50 chips rake per pot
+
+# Bankroll management (optional, defaults to disabled).
+# reset_bankroll_each_hand = false
+# bankroll_refill_threshold = 1000  # Refill when stack <= 1000
+
+# Randomize seat assignments before each hand (optional, defaults to false).
+# randomize_seats = true
 
 [game.bet_limit]
 type = "no_limit"
 min_raise = 20
 
+[[game.bots]]
+bot_type = "flock_bot"
+name = "FlockBot-1"
+
+[[game.bots]]
+bot_type = "chump_bot"
+name = "ChumpBot-1"
+
 [[game.bots]]
 bot_type = "call_bot"
-name = "Alice"
+name = "CallBot-1"
 
 [[game.bots]]
 bot_type = "fold_bot"
-name = "Bob"
+name = "FoldBot-1"
+
+[[game.bots]]
+bot_type = "raise_bot"
+name = "RaiseBot-1"
 
 [[game.bots]]
 bot_type = "random_bot"
-name = "Charlie"
+name = "RandomBot-1"
+
+[[game.bots]]
+bot_type = "flock_bot"
+name = "FlockBot-2"
+
+[[game.bots]]
+bot_type = "chump_bot"
+name = "ChumpBot-2"
+
+[[game.bots]]
+bot_type = "call_bot"
+name = "CallBot-2"
+
+[[game.bots]]
+bot_type = "random_bot"
+name = "RandomBot-2"

holdem_core/src/game/bot_factory.rs

@@ -9,11 +9,13 @@
 //! | `bot_type` string | Bot implementation |
 //! |-------------------|--------------------|
 //! | `"call_bot"` | [`CallBot`](super::bots::CallBot) |
+//! | `"chump_bot"` | [`ChumpBot`](super::bots::ChumpBot) |
+//! | `"flock_bot"` | [`FlockBot`](super::bots::FlockBot) |
 //! | `"fold_bot"` | [`FoldBot`](super::bots::FoldBot) |
 //! | `"raise_bot"` | [`RaiseBot`](super::bots::RaiseBot) |
 //! | `"random_bot"` | [`RandomBot`](super::bots::RandomBot) |
 
-use super::bots::{CallBot, FoldBot, RandomBot, RaiseBot};
+use super::bots::{CallBot, ChumpBot, FlockBot, FoldBot, RandomBot, RaiseBot};
 use super::config::BotConfig;
 use super::player::HoldemPlayer;
 use super::types::PlayerId;
@@ -54,6 +56,8 @@ pub fn create_bot(config: &BotConfig, id: PlayerId) -> Result<Box<dyn HoldemPlay
         .unwrap_or_else(|| config.bot_type.clone());
     match config.bot_type.as_str() {
         "call_bot" => Ok(Box::new(CallBot::new(id, name))),
+        "chump_bot" => Ok(Box::new(ChumpBot::new(id, name))),
+        "flock_bot" => Ok(Box::new(FlockBot::new(id, name))),
         "fold_bot" => Ok(Box::new(FoldBot::new(id, name))),
         "raise_bot" => Ok(Box::new(RaiseBot::new(id, name))),
         "random_bot" => Ok(Box::new(RandomBot::new(id, name))),

holdem_core/src/game/bots/call_bot.rs

@@ -126,8 +126,10 @@ mod tests {
                 is_dealer: true,
                 is_small_blind: false,
                 is_big_blind: false,
+                bankroll: 0,
             })],
             actions_this_hand: vec![],
+            num_raises: 0,
             hand_number: 1,
             active_players: 2,
         }

holdem_core/src/game/bots/chump_bot.rs

@@ -0,0 +1,523 @@
+//! A loose-passive calling station bot.
+//!
+//! [`ChumpBot`] plays a loose-passive strategy: it calls with any two cards
+//! preflop, rarely raises, and calls down with any made hand or draw. It is
+//! the classic "calling station" archetype.
+
+use crate::game::action::Action;
+use crate::game::game_info::GameInfo;
+use crate::game::player::HoldemPlayer;
+use crate::game::types::{ChipCount, PlayerId};
+use crate::{HandValue, HoleCards, Street};
+
+/// A **loose-passive calling station** bot.
+///
+/// ChumpBot almost never folds preflop, rarely raises, and calls down with
+/// any made hand or draw. It only folds postflop when facing a large bet
+/// with absolutely nothing.
+///
+/// # Examples
+///
+/// ```
+/// use holdem_core::game::bots::ChumpBot;
+/// use holdem_core::game::player::HoldemPlayer;
+/// use holdem_core::game::types::PlayerId;
+///
+/// let bot = ChumpBot::new(PlayerId(0), "ChumpBot-1".to_string());
+/// assert_eq!(bot.id(), PlayerId(0));
+/// assert_eq!(bot.name(), "ChumpBot-1");
+/// ```
+#[derive(Debug)]
+pub struct ChumpBot {
+    id: PlayerId,
+    name: String,
+    hole_cards: Option<HoleCards>,
+}
+
+impl ChumpBot {
+    /// Creates a new [`ChumpBot`] with the given player ID and display name.
+    pub fn new(id: PlayerId, name: String) -> Self {
+        Self {
+            id,
+            name,
+            hole_cards: None,
+        }
+    }
+
+    /// Returns this player's current stack.
+    fn stack(&self, game_info: &GameInfo) -> ChipCount {
+        game_info
+            .player_by_id(self.id)
+            .map(|p| p.stack)
+            .unwrap_or(0)
+    }
+
+    /// Computes the call amount for this player.
+    fn call_amount(&self, game_info: &GameInfo) -> ChipCount {
+        let wagered = game_info
+            .player_by_id(self.id)
+            .map(|p| p.wagered_this_round)
+            .unwrap_or(0);
+        game_info.current_bet.saturating_sub(wagered)
+    }
+
+    // -----------------------------------------------------------------------
+    // Postflop heuristic evaluation
+    // -----------------------------------------------------------------------
+
+    /// Returns `true` if the bot has any pair or better with the board.
+    fn has_pair_or_better(&self, game_info: &GameInfo) -> bool {
+        let hc = match self.hole_cards {
+            Some(hc) => hc,
+            None => return false,
+        };
+
+        let c1 = hc.first_card();
+        let c2 = hc.second_card();
+        let board = &game_info.board;
+
+        if board.is_empty() {
+            return false;
+        }
+
+        // Pocket pair always counts
+        if hc.is_pair() {
+            return true;
+        }
+
+        // Check if either hole card pairs with the board
+        for card in board {
+            if card.rank() == c1.rank() || card.rank() == c2.rank() {
+                return true;
+            }
+        }
+
+        // Check for two pair using board cards
+        let mut board_ranks: Vec<u8> = board.iter().map(|c| c.rank()).collect();
+        board_ranks.sort_unstable();
+        for window in board_ranks.windows(2) {
+            if window[0] == window[1] {
+                return true;
+            }
+        }
+
+        false
+    }
+
+    /// Returns `true` if the bot has a flush draw (4 cards of the same suit).
+    fn has_flush_draw(&self, game_info: &GameInfo) -> bool {
+        let hc = match self.hole_cards {
+            Some(hc) => hc,
+            None => return false,
+        };
+
+        let c1 = hc.first_card();
+        let c2 = hc.second_card();
+        let board = &game_info.board;
+
+        let all_cards = std::iter::once(c1)
+            .chain(std::iter::once(c2))
+            .chain(board.iter().copied());
+
+        for suit in 0u8..4 {
+            if all_cards
+                .clone()
+                .filter(|c| c.suit() == suit)
+                .count()
+                >= 4
+            {
+                return true;
+            }
+        }
+        false
+    }
+
+    /// Returns `true` if the bot has a straight draw (4 consecutive ranks).
+    fn has_straight_draw(&self, game_info: &GameInfo) -> bool {
+        let hc = match self.hole_cards {
+            Some(hc) => hc,
+            None => return false,
+        };
+
+        let c1 = hc.first_card();
+        let c2 = hc.second_card();
+        let board = &game_info.board;
+
+        let mut ranks: Vec<u8> = std::iter::once(c1.rank())
+            .chain(std::iter::once(c2.rank()))
+            .chain(board.iter().map(|c| c.rank()))
+            .collect();
+        ranks.sort_unstable();
+        ranks.dedup();
+
+        if ranks.len() >= 4 {
+            // Open-ended: 4 consecutive ranks
+            for window in ranks.windows(4) {
+                if window[3] - window[0] == 3
+                    && window[1] - window[0] == 1
+                    && window[2] - window[1] == 1
+                    && window[3] - window[2] == 1
+                {
+                    return true;
+                }
+            }
+
+            // Gutshot: 4 ranks spanning 5 with exactly one gap
+            for window in ranks.windows(4) {
+                let total_span = window[3] - window[0];
+                if total_span == 4 {
+                    let gaps = (window[1] - window[0] - 1)
+                        + (window[2] - window[1] - 1)
+                        + (window[3] - window[2] - 1);
+                    if gaps == 1 {
+                        return true;
+                    }
+                }
+            }
+        }
+
+        // Ace-low straight draw: A-2-3-4
+        let has_ace = ranks.contains(&12);
+        if has_ace && ranks.contains(&0) && ranks.contains(&1) && ranks.contains(&2) {
+            return true;
+        }
+
+        false
+    }
+
+    // -----------------------------------------------------------------------
+    // Preflop action logic
+    // -----------------------------------------------------------------------
+
+    fn act_preflop(&self, game_info: &GameInfo) -> Action {
+        let call_amount = self.call_amount(game_info);
+        let stack = self.stack(game_info);
+
+        if call_amount == 0 {
+            // No bet: check (never raise preflop)
+            Action::Check
+        } else {
+            // Call any bet, unless facing an all-in that costs more than half
+            // the stack
+            if call_amount > stack / 2 && stack > call_amount {
+                // Facing a bet that costs more than half our stack — fold
+                Action::Fold
+            } else if stack <= call_amount {
+                // Can't afford full call — go all-in
+                Action::AllIn
+            } else {
+                Action::Call
+            }
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Postflop action logic
+    // -----------------------------------------------------------------------
+
+    fn act_postflop(&self, game_info: &GameInfo) -> Action {
+        let call_amount = self.call_amount(game_info);
+        let stack = self.stack(game_info);
+
+        // Has any pair or better: call (never raise)
+        if self.has_pair_or_better(game_info) {
+            if call_amount == 0 {
+                Action::Check
+            } else if stack <= call_amount {
+                Action::AllIn
+            } else {
+                Action::Call
+            }
+        } else if self.has_flush_draw(game_info) || self.has_straight_draw(game_info) {
+            // Has a draw: call
+            if call_amount == 0 {
+                Action::Check
+            } else if stack <= call_amount {
+                Action::AllIn
+            } else {
+                Action::Call
+            }
+        } else {
+            // Nothing: check if free, call small bets (≤ pot/2), fold to large bets
+            if call_amount == 0 {
+                Action::Check
+            } else if call_amount <= game_info.pot / 2 {
+                if stack <= call_amount {
+                    Action::AllIn
+                } else {
+                    Action::Call
+                }
+            } else {
+                Action::Fold
+            }
+        }
+    }
+}
+
+impl HoldemPlayer for ChumpBot {
+    fn id(&self) -> PlayerId {
+        self.id
+    }
+
+    fn name(&self) -> &str {
+        &self.name
+    }
+
+    fn init(&mut self, _game_info: &GameInfo) {}
+
+    fn game_start_event(&mut self, _game_info: &GameInfo) {}
+
+    fn hole_cards_dealt(&mut self, hole_cards: &HoleCards, _game_info: &GameInfo) {
+        self.hole_cards = Some(*hole_cards);
+    }
+
+    fn stage_event(&mut self, _game_info: &GameInfo) {}
+
+    fn act(&mut self, game_info: &GameInfo) -> Action {
+        match game_info.street {
+            Street::Preflop => self.act_preflop(game_info),
+            _ => self.act_postflop(game_info),
+        }
+    }
+
+    fn action_event(
+        &mut self,
+        _player_id: PlayerId,
+        _action: &Action,
+        _game_info: &GameInfo,
+    ) {
+    }
+
+    fn showdown_event(
+        &mut self,
+        _player_id: PlayerId,
+        _hole_cards: Option<&HoleCards>,
+        _hand_value: Option<&HandValue>,
+        _game_info: &GameInfo,
+    ) {
+    }
+
+    fn game_over_event(&mut self, _game_info: &GameInfo) {}
+
+    fn on_eliminated(&self, _placement: u32) {}
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::game::betting::BetLimit;
+    use crate::game::player_info::{PlayerInfo, PlayerState};
+    use crate::Card;
+    use std::str::FromStr;
+
+    /// Helper to build a minimal [`GameInfo`] for testing.
+    fn make_game_info(
+        current_bet: ChipCount,
+        pot: ChipCount,
+        stack: ChipCount,
+        wagered_this_round: ChipCount,
+        street: Street,
+        board: Vec<Card>,
+    ) -> GameInfo {
+        GameInfo {
+            num_seats: 2,
+            bet_limit: BetLimit::NoLimit { min_raise: 20 },
+            small_blind: 10,
+            big_blind: 20,
+            ante: 0,
+            street,
+            board,
+            pot,
+            current_bet,
+            min_raise: 20,
+            button_seat: 0,
+            small_blind_seat: 0,
+            big_blind_seat: 1,
+            next_to_act: Some(0),
+            players: vec![Some(PlayerInfo {
+                id: PlayerId(0),
+                name: "ChumpBot".to_string(),
+                seat: 0,
+                stack,
+                wagered_this_round,
+                wagered_this_hand: wagered_this_round,
+                state: PlayerState::Active,
+                has_acted_this_round: false,
+                is_dealer: true,
+                is_small_blind: false,
+                is_big_blind: false,
+                bankroll: 0,
+            })],
+            actions_this_hand: vec![],
+            num_raises: 0,
+            hand_number: 1,
+            active_players: 2,
+        }
+    }
+
+    #[test]
+    fn chump_bot_calls_any_bet_preflop() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("7c").unwrap(),
+                Card::from_str("2d").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Even 72 offsuit — call
+        let game_info = make_game_info(40, 60, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn chump_bot_checks_when_free_preflop() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("7c").unwrap(),
+                Card::from_str("2d").unwrap(),
+            )
+            .unwrap(),
+        );
+        let game_info = make_game_info(0, 30, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Check);
+    }
+
+    #[test]
+    fn chump_bot_folds_preflop_to_massive_bet() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("7c").unwrap(),
+                Card::from_str("2d").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Facing a bet of 600 (> half of 1000 stack)
+        let game_info = make_game_info(600, 620, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Fold);
+    }
+
+    #[test]
+    fn chump_bot_calls_with_pair_postflop() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        // K7 with K on board — pair of Kings
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("Ks").unwrap(),
+                Card::from_str("7c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("4h").unwrap(),
+            Card::from_str("2c").unwrap(),
+        ];
+        let game_info = make_game_info(80, 120, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn chump_bot_calls_small_bet_with_nothing_postflop() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("3s").unwrap(),
+                Card::from_str("2c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("Qh").unwrap(),
+            Card::from_str("Jc").unwrap(),
+        ];
+        // Pot is 120, bet is 40 (≤ pot/2 = 60) — call
+        let game_info = make_game_info(40, 120, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn chump_bot_folds_to_large_bet_with_nothing_postflop() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("3s").unwrap(),
+                Card::from_str("2c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("Qh").unwrap(),
+            Card::from_str("Jc").unwrap(),
+        ];
+        // Pot is 120, bet is 100 (> pot/2 = 60) — fold
+        let game_info = make_game_info(100, 120, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Fold);
+    }
+
+    #[test]
+    fn chump_bot_checks_with_nothing_when_free_postflop() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("3s").unwrap(),
+                Card::from_str("2c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("Qh").unwrap(),
+            Card::from_str("Jc").unwrap(),
+        ];
+        let game_info = make_game_info(0, 60, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Check);
+    }
+
+    #[test]
+    fn chump_bot_calls_with_flush_draw() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        // Two spades
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("9s").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Board with two more spades — flush draw
+        let board = vec![
+            Card::from_str("Ks").unwrap(),
+            Card::from_str("4s").unwrap(),
+            Card::from_str("2c").unwrap(),
+        ];
+        let game_info = make_game_info(80, 120, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn chump_bot_trait_methods_are_no_ops() {
+        let mut bot = ChumpBot::new(PlayerId(0), "ChumpBot".to_string());
+        let game_info = make_game_info(0, 30, 1000, 0, Street::Preflop, vec![]);
+
+        bot.init(&game_info);
+        bot.game_start_event(&game_info);
+        bot.hole_cards_dealt(
+            &HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("Kh").unwrap(),
+            )
+            .unwrap(),
+            &game_info,
+        );
+        bot.stage_event(&game_info);
+        bot.action_event(PlayerId(1), &Action::Call, &game_info);
+        bot.showdown_event(PlayerId(1), None, None, &game_info);
+        bot.game_over_event(&game_info);
+        bot.on_eliminated(3);
+    }
+}

holdem_core/src/game/bots/flock_bot.rs

@@ -0,0 +1,868 @@
+//! A tight-aggressive bot that only enters pots with strong hands.
+//!
+//! [`FlockBot`] plays a selective, aggressive strategy: it folds most hands
+//! preflop, raises with premium holdings, and plays postflop based on
+//! heuristic hand strength evaluation.
+
+use crate::game::action::Action;
+use crate::game::game_info::GameInfo;
+use crate::game::player::HoldemPlayer;
+use crate::game::types::{ChipCount, PlayerId};
+use crate::{Card, HandValue, HoleCards, Street};
+
+// Rank constants (0=Two, 12=Ace)
+const RANK_JACK: u8 = 9;
+const RANK_TEN: u8 = 8;
+const RANK_NINE: u8 = 7;
+const RANK_SEVEN: u8 = 5;
+const RANK_ACE: u8 = 12;
+const RANK_KING: u8 = 11;
+const RANK_QUEEN: u8 = 10;
+
+/// Preflop hand strength classification.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+enum PreflopStrength {
+    /// Not playable — fold if there's any bet.
+    None,
+    /// Top ~15%: 88+, ATs+, KJs+, QJs, AQo.
+    Playable,
+    /// Top ~10%: TT+, 99, AQs+, AJs+, KQs, AKo.
+    Strong,
+    /// Top ~3%: AA, KK, QQ, JJ, AKs.
+    Premium,
+}
+
+/// Postflop hand strength classification.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+enum PostflopStrength {
+    /// Nothing — no pair, no draw.
+    Nothing,
+    /// Decent hand — middle pair or better, any pair with hole cards.
+    Decent,
+    /// Strong made hand — pair of Jacks or better using board + hole cards,
+    /// two pair, trips, straight, flush, full house, etc.
+    Strong,
+}
+
+/// A **tight-aggressive** poker bot.
+///
+/// FlockBot only enters pots with strong hands (top 15% preflop), raises or
+/// re-raises with premium holdings, and folds marginal hands under pressure.
+/// Postflop it uses heuristic hand evaluation to decide whether to check, call,
+/// or raise.
+///
+/// # Examples
+///
+/// ```
+/// use holdem_core::game::bots::FlockBot;
+/// use holdem_core::game::player::HoldemPlayer;
+/// use holdem_core::game::types::PlayerId;
+///
+/// let bot = FlockBot::new(PlayerId(0), "FlockBot-1".to_string());
+/// assert_eq!(bot.id(), PlayerId(0));
+/// assert_eq!(bot.name(), "FlockBot-1");
+/// ```
+#[derive(Debug)]
+pub struct FlockBot {
+    id: PlayerId,
+    name: String,
+    hole_cards: Option<HoleCards>,
+}
+
+impl FlockBot {
+    /// Creates a new [`FlockBot`] with the given player ID and display name.
+    pub fn new(id: PlayerId, name: String) -> Self {
+        Self {
+            id,
+            name,
+            hole_cards: None,
+        }
+    }
+
+    /// Returns this player's current stack.
+    fn stack(&self, game_info: &GameInfo) -> ChipCount {
+        game_info
+            .player_by_id(self.id)
+            .map(|p| p.stack)
+            .unwrap_or(0)
+    }
+
+    /// Computes the call amount for this player.
+    fn call_amount(&self, game_info: &GameInfo) -> ChipCount {
+        let wagered = game_info
+            .player_by_id(self.id)
+            .map(|p| p.wagered_this_round)
+            .unwrap_or(0);
+        game_info.current_bet.saturating_sub(wagered)
+    }
+
+    /// Returns the wagered amount this round.
+    fn wagered_this_round(&self, game_info: &GameInfo) -> ChipCount {
+        game_info
+            .player_by_id(self.id)
+            .map(|p| p.wagered_this_round)
+            .unwrap_or(0)
+    }
+
+    /// Classifies hole cards into a preflop strength category.
+    fn classify_preflop(&self) -> PreflopStrength {
+        let hc = match self.hole_cards {
+            Some(hc) => hc,
+            None => return PreflopStrength::None,
+        };
+
+        let r1 = hc.first_card().rank();
+        let r2 = hc.second_card().rank();
+        let suited = hc.is_suited();
+        let pair = hc.is_pair();
+
+        // Premium: AA, KK, QQ, JJ, AKs
+        if pair && r1 >= RANK_JACK {
+            return PreflopStrength::Premium;
+        }
+        if r1 == RANK_ACE && r2 == RANK_KING && suited {
+            return PreflopStrength::Premium;
+        }
+
+        // Strong: TT, 99, AQs, AJs, KQs, AKo
+        if pair && r1 >= RANK_NINE {
+            return PreflopStrength::Strong;
+        }
+        if r1 == RANK_ACE && r2 == RANK_QUEEN && suited {
+            return PreflopStrength::Strong;
+        }
+        if r1 == RANK_ACE && r2 == RANK_JACK && suited {
+            return PreflopStrength::Strong;
+        }
+        if r1 == RANK_KING && r2 == RANK_QUEEN && suited {
+            return PreflopStrength::Strong;
+        }
+        if r1 == RANK_ACE && r2 == RANK_KING {
+            // AKo (offsuit) is strong
+            return PreflopStrength::Strong;
+        }
+
+        // Playable: 88, 77, ATs, KJs, QJs, AQo
+        if pair && r1 >= RANK_SEVEN {
+            return PreflopStrength::Playable;
+        }
+        if r1 == RANK_ACE && r2 == RANK_TEN && suited {
+            return PreflopStrength::Playable;
+        }
+        if r1 == RANK_KING && r2 == RANK_JACK && suited {
+            return PreflopStrength::Playable;
+        }
+        if r1 == RANK_QUEEN && r2 == RANK_JACK && suited {
+            return PreflopStrength::Playable;
+        }
+        if r1 == RANK_ACE && r2 == RANK_QUEEN {
+            // AQo (offsuit)
+            return PreflopStrength::Playable;
+        }
+
+        PreflopStrength::None
+    }
+
+
+    /// Computes a legal raise total.
+    ///
+    /// Returns `None` if raising is not possible (stack too small, raise
+    /// limit reached, etc.).
+    fn compute_raise_total(
+        &self,
+        game_info: &GameInfo,
+        target_total: ChipCount,
+    ) -> Option<Action> {
+        let stack = self.stack(game_info);
+        let call_amount = self.call_amount(game_info);
+        let wagered = self.wagered_this_round(game_info);
+        let max_total = wagered + stack;
+
+        // Can't raise if we can't even call
+        if stack <= call_amount {
+            return None;
+        }
+
+        let min_raise_total = game_info.current_bet + game_info.min_raise;
+
+        // Ensure target is at least the minimum raise
+        let effective_total = target_total.max(min_raise_total);
+
+        if effective_total > max_total {
+            // Can't afford the raise; go all-in instead
+            Some(Action::AllIn)
+        } else {
+            Some(Action::Raise {
+                total: effective_total,
+            })
+        }
+    }
+
+    /// Returns a pot-sized raise action, or all-in if that exceeds the stack.
+    fn pot_sized_raise(&self, game_info: &GameInfo) -> Option<Action> {
+        let pot_raise_total = game_info.current_bet + game_info.pot + game_info.min_raise;
+        self.compute_raise_total(game_info, pot_raise_total)
+    }
+
+    // -----------------------------------------------------------------------
+    // Postflop heuristic evaluation
+    // -----------------------------------------------------------------------
+
+    /// Evaluates postflop hand strength using simple heuristics.
+    fn evaluate_postflop(&self, game_info: &GameInfo) -> PostflopStrength {
+        let hc = match self.hole_cards {
+            Some(hc) => hc,
+            None => return PostflopStrength::Nothing,
+        };
+
+        let c1 = hc.first_card();
+        let c2 = hc.second_card();
+        let board = &game_info.board;
+
+        if board.is_empty() {
+            return PostflopStrength::Nothing;
+        }
+
+        // Count pairs with the board
+        let mut pair_count = 0u8;
+        let mut high_pair_rank = 0u8;
+        for card in board {
+            if card.rank() == c1.rank() {
+                pair_count += 1;
+                high_pair_rank = high_pair_rank.max(c1.rank());
+            }
+            if card.rank() == c2.rank() {
+                pair_count += 1;
+                high_pair_rank = high_pair_rank.max(c2.rank());
+            }
+        }
+
+        // Pocket pair higher than any board card counts as "strong"
+        if hc.is_pair() {
+            let pocket_rank = c1.rank();
+            let max_board_rank = board.iter().map(|c| c.rank()).max().unwrap_or(0);
+            if pocket_rank > max_board_rank {
+                return PostflopStrength::Strong;
+            }
+        }
+
+        // Check for trips or better
+        if pair_count >= 2 {
+            return PostflopStrength::Strong;
+        }
+
+        // Check for flush (5 cards of same suit between hole cards and board)
+        if Self::has_flush(c1, c2, board) {
+            return PostflopStrength::Strong;
+        }
+
+        // Check for straight
+        if Self::has_straight(c1, c2, board) {
+            return PostflopStrength::Strong;
+        }
+
+        // One pair
+        if pair_count == 1 {
+            // Strong if the pair rank is Jack or higher
+            if high_pair_rank >= RANK_JACK {
+                return PostflopStrength::Strong;
+            }
+            // Otherwise decent (middle pair or low pair)
+            return PostflopStrength::Decent;
+        }
+
+        // Check for flush draw (4 cards of same suit)
+        if Self::has_flush_draw(c1, c2, board) {
+            return PostflopStrength::Decent;
+        }
+
+        // Check for straight draw (open-ended or gutshot with 4 consecutive)
+        if Self::has_straight_draw(c1, c2, board) {
+            return PostflopStrength::Decent;
+        }
+
+        // Two overcards (both hole cards higher than all board cards)
+        let max_board_rank = board.iter().map(|c| c.rank()).max().unwrap_or(255);
+        if c1.rank() > max_board_rank && c2.rank() > max_board_rank {
+            return PostflopStrength::Decent;
+        }
+
+        PostflopStrength::Nothing
+    }
+
+    /// Checks if the combined cards form a flush.
+    fn has_flush(c1: Card, c2: Card, board: &[Card]) -> bool {
+        let all_cards = std::iter::once(c1)
+            .chain(std::iter::once(c2))
+            .chain(board.iter().copied());
+
+        for suit in 0u8..4 {
+            if all_cards
+                .clone()
+                .filter(|c| c.suit() == suit)
+                .count()
+                >= 5
+            {
+                return true;
+            }
+        }
+        false
+    }
+
+    /// Checks if the combined cards form a straight.
+    fn has_straight(c1: Card, c2: Card, board: &[Card]) -> bool {
+        let mut ranks: Vec<u8> = std::iter::once(c1.rank())
+            .chain(std::iter::once(c2.rank()))
+            .chain(board.iter().map(|c| c.rank()))
+            .collect();
+        ranks.sort_unstable();
+        ranks.dedup();
+
+        // Check for 5 consecutive ranks
+        if ranks.len() >= 5 {
+            for window in ranks.windows(5) {
+                if window[4] - window[0] == 4
+                    && window[1] - window[0] == 1
+                    && window[2] - window[1] == 1
+                    && window[3] - window[2] == 1
+                    && window[4] - window[3] == 1
+                {
+                    return true;
+                }
+            }
+        }
+
+        // Check for wheel (A-2-3-4-5)
+        let has_ace = ranks.contains(&RANK_ACE);
+        if has_ace && ranks.contains(&0) && ranks.contains(&1) && ranks.contains(&2) && ranks.contains(&3)
+        {
+            return true;
+        }
+
+        false
+    }
+
+    /// Checks for a flush draw (4 cards of the same suit).
+    fn has_flush_draw(c1: Card, c2: Card, board: &[Card]) -> bool {
+        let all_cards = std::iter::once(c1)
+            .chain(std::iter::once(c2))
+            .chain(board.iter().copied());
+
+        for suit in 0u8..4 {
+            if all_cards
+                .clone()
+                .filter(|c| c.suit() == suit)
+                .count()
+                >= 4
+            {
+                return true;
+            }
+        }
+        false
+    }
+
+    /// Checks for a straight draw (4 consecutive ranks).
+    fn has_straight_draw(c1: Card, c2: Card, board: &[Card]) -> bool {
+        let mut ranks: Vec<u8> = std::iter::once(c1.rank())
+            .chain(std::iter::once(c2.rank()))
+            .chain(board.iter().map(|c| c.rank()))
+            .collect();
+        ranks.sort_unstable();
+        ranks.dedup();
+
+        if ranks.len() >= 4 {
+            // Open-ended straight draw: 4 consecutive ranks
+            for window in ranks.windows(4) {
+                if window[3] - window[0] == 3
+                    && window[1] - window[0] == 1
+                    && window[2] - window[1] == 1
+                    && window[3] - window[2] == 1
+                {
+                    return true;
+                }
+            }
+
+            // Gutshot: 4 ranks with exactly one gap of size 2
+            for window in ranks.windows(4) {
+                let total_span = window[3] - window[0];
+                if total_span == 4 {
+                    let gaps = (window[1] - window[0] - 1)
+                        + (window[2] - window[1] - 1)
+                        + (window[3] - window[2] - 1);
+                    if gaps == 1 {
+                        return true;
+                    }
+                }
+            }
+        }
+
+        // Ace-low straight draw: A-2-3-4
+        let has_ace = ranks.contains(&RANK_ACE);
+        if has_ace && ranks.contains(&0) && ranks.contains(&1) && ranks.contains(&2) {
+            return true;
+        }
+        if has_ace && ranks.contains(&0) && ranks.contains(&1) && ranks.contains(&3) {
+            return true;
+        }
+        if has_ace && ranks.contains(&0) && ranks.contains(&2) && ranks.contains(&3) {
+            return true;
+        }
+
+        false
+    }
+
+    // -----------------------------------------------------------------------
+    // Preflop action logic
+    // -----------------------------------------------------------------------
+
+    fn act_preflop(&self, game_info: &GameInfo) -> Action {
+        let strength = self.classify_preflop();
+        let call_amount = self.call_amount(game_info);
+        let stack = self.stack(game_info);
+        let big_blind = game_info.big_blind;
+        let num_raises = game_info.num_raises;
+
+        match strength {
+            PreflopStrength::None => {
+                // Fold if there's any bet, check if free
+                if call_amount == 0 {
+                    Action::Check
+                } else {
+                    Action::Fold
+                }
+            }
+            PreflopStrength::Playable => {
+                // Call if cheap (bet ≤ 3x BB), fold if expensive
+                if call_amount == 0 {
+                    Action::Check
+                } else if call_amount <= 3 * big_blind {
+                    if stack <= call_amount {
+                        Action::AllIn
+                    } else {
+                        Action::Call
+                    }
+                } else {
+                    Action::Fold
+                }
+            }
+            PreflopStrength::Strong => {
+                // num_raises is the count of voluntary raises (excludes blinds).
+                if num_raises == 0 {
+                    // No voluntary raise: raise to 3x BB
+                    let raise_target = 3 * big_blind;
+                    self.compute_raise_total(game_info, raise_target)
+                        .unwrap_or_else(|| {
+                            if stack <= call_amount {
+                                Action::AllIn
+                            } else {
+                                Action::Call
+                            }
+                        })
+                } else if num_raises == 1 {
+                    // Facing one voluntary raise: call
+                    if stack <= call_amount {
+                        Action::AllIn
+                    } else {
+                        Action::Call
+                    }
+                } else {
+                    // 2+ voluntary raises: fold (not premium)
+                    Action::Fold
+                }
+            }
+            PreflopStrength::Premium => {
+                // Always raise/re-raise: 3x BB or 3x current bet, whichever is higher
+                let raise_target = (3 * big_blind).max(3 * game_info.current_bet);
+                self.compute_raise_total(game_info, raise_target)
+                    .unwrap_or(Action::AllIn)
+            }
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Postflop action logic
+    // -----------------------------------------------------------------------
+
+    fn act_postflop(&self, game_info: &GameInfo) -> Action {
+        let strength = self.evaluate_postflop(game_info);
+        let call_amount = self.call_amount(game_info);
+        let stack = self.stack(game_info);
+
+        match strength {
+            PostflopStrength::Nothing => {
+                // Check if free, fold if there's a bet
+                if call_amount == 0 {
+                    Action::Check
+                } else {
+                    Action::Fold
+                }
+            }
+            PostflopStrength::Decent => {
+                // Call
+                if call_amount == 0 {
+                    Action::Check
+                } else if stack <= call_amount {
+                    Action::AllIn
+                } else {
+                    Action::Call
+                }
+            }
+            PostflopStrength::Strong => {
+                // Raise pot-sized or max legal raise
+                self.pot_sized_raise(game_info).unwrap_or_else(|| {
+                    // Can't raise (e.g., stack is 0); just call or check
+                    if call_amount == 0 {
+                        Action::Check
+                    } else if stack <= call_amount {
+                        Action::AllIn
+                    } else {
+                        Action::Call
+                    }
+                })
+            }
+        }
+    }
+}
+
+impl HoldemPlayer for FlockBot {
+    fn id(&self) -> PlayerId {
+        self.id
+    }
+
+    fn name(&self) -> &str {
+        &self.name
+    }
+
+    fn init(&mut self, _game_info: &GameInfo) {}
+
+    fn game_start_event(&mut self, _game_info: &GameInfo) {}
+
+    fn hole_cards_dealt(&mut self, hole_cards: &HoleCards, _game_info: &GameInfo) {
+        self.hole_cards = Some(*hole_cards);
+    }
+
+    fn stage_event(&mut self, _game_info: &GameInfo) {}
+
+    fn act(&mut self, game_info: &GameInfo) -> Action {
+        match game_info.street {
+            Street::Preflop => self.act_preflop(game_info),
+            _ => self.act_postflop(game_info),
+        }
+    }
+
+    fn action_event(
+        &mut self,
+        _player_id: PlayerId,
+        _action: &Action,
+        _game_info: &GameInfo,
+    ) {
+    }
+
+    fn showdown_event(
+        &mut self,
+        _player_id: PlayerId,
+        _hole_cards: Option<&HoleCards>,
+        _hand_value: Option<&HandValue>,
+        _game_info: &GameInfo,
+    ) {
+    }
+
+    fn game_over_event(&mut self, _game_info: &GameInfo) {}
+
+    fn on_eliminated(&self, _placement: u32) {}
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::game::betting::BetLimit;
+    use crate::game::player_info::{PlayerInfo, PlayerState};
+    use std::str::FromStr;
+
+    /// Helper to build a minimal [`GameInfo`] for testing.
+    fn make_game_info(
+        current_bet: ChipCount,
+        pot: ChipCount,
+        stack: ChipCount,
+        wagered_this_round: ChipCount,
+        street: Street,
+        board: Vec<Card>,
+    ) -> GameInfo {
+        GameInfo {
+            num_seats: 2,
+            bet_limit: BetLimit::NoLimit { min_raise: 20 },
+            small_blind: 10,
+            big_blind: 20,
+            ante: 0,
+            street,
+            board,
+            pot,
+            current_bet,
+            min_raise: 20,
+            button_seat: 0,
+            small_blind_seat: 0,
+            big_blind_seat: 1,
+            next_to_act: Some(0),
+            players: vec![Some(PlayerInfo {
+                id: PlayerId(0),
+                name: "FlockBot".to_string(),
+                seat: 0,
+                stack,
+                wagered_this_round,
+                wagered_this_hand: wagered_this_round,
+                state: PlayerState::Active,
+                has_acted_this_round: false,
+                is_dealer: true,
+                is_small_blind: false,
+                is_big_blind: false,
+                bankroll: 0,
+            })],
+            actions_this_hand: vec![],
+            num_raises: 0,
+            hand_number: 1,
+            active_players: 2,
+        }
+    }
+
+    #[test]
+    fn flock_bot_folds_weak_hand_preflop_facing_bet() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // 72 offsuit — weak hand
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("7c").unwrap(),
+                Card::from_str("2d").unwrap(),
+            )
+            .unwrap(),
+        );
+        let game_info = make_game_info(40, 60, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Fold);
+    }
+
+    #[test]
+    fn flock_bot_checks_weak_hand_preflop_when_free() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // 72 offsuit — weak hand
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("7c").unwrap(),
+                Card::from_str("2d").unwrap(),
+            )
+            .unwrap(),
+        );
+        let game_info = make_game_info(0, 30, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Check);
+    }
+
+    #[test]
+    fn flock_bot_raises_premium_hand_preflop() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // AA — premium
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("Ac").unwrap(),
+            )
+            .unwrap(),
+        );
+        let game_info = make_game_info(0, 30, 1000, 0, Street::Preflop, vec![]);
+        let action = bot.act(&game_info);
+        // Should raise to 3x BB = 60
+        assert!(matches!(action, Action::Raise { total: 60 }));
+    }
+
+    #[test]
+    fn flock_bot_calls_playable_hand_preflop() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // 88 — playable
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("8s").unwrap(),
+                Card::from_str("8c").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Facing a bet of 40 (2x BB = within 3x BB)
+        let game_info = make_game_info(40, 60, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn flock_bot_folds_playable_hand_to_big_raise() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // 88 — playable but not worth a huge bet
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("8s").unwrap(),
+                Card::from_str("8c").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Facing a raise of 100 (> 3x BB = 60)
+        let game_info = make_game_info(100, 120, 1000, 0, Street::Preflop, vec![]);
+        assert_eq!(bot.act(&game_info), Action::Fold);
+    }
+
+    #[test]
+    fn flock_bot_folds_nothing_postflop_facing_bet() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("3s").unwrap(),
+                Card::from_str("2c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("Qh").unwrap(),
+            Card::from_str("Jc").unwrap(),
+        ];
+        let game_info = make_game_info(40, 80, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Fold);
+    }
+
+    #[test]
+    fn flock_bot_checks_nothing_postflop_when_free() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("3s").unwrap(),
+                Card::from_str("2c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("Qh").unwrap(),
+            Card::from_str("Jc").unwrap(),
+        ];
+        let game_info = make_game_info(0, 60, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Check);
+    }
+
+    #[test]
+    fn flock_bot_raises_strong_postflop() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // KQ with K-Q-J on board — pair of Kings (strong)
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("Ks").unwrap(),
+                Card::from_str("Qc").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("Kd").unwrap(),
+            Card::from_str("Jh").unwrap(),
+            Card::from_str("4c").unwrap(),
+        ];
+        let game_info = make_game_info(0, 60, 1000, 0, Street::Flop, board);
+        let action = bot.act(&game_info);
+        // Should raise (pot-sized)
+        assert!(
+            matches!(action, Action::Raise { .. } | Action::AllIn),
+            "Expected raise or all-in for strong hand, got {:?}",
+            action
+        );
+    }
+
+    #[test]
+    fn flock_bot_calls_decent_postflop() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // 97 with 9-x-x on board — middle pair (decent)
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("9s").unwrap(),
+                Card::from_str("7c").unwrap(),
+            )
+            .unwrap(),
+        );
+        let board = vec![
+            Card::from_str("9d").unwrap(),
+            Card::from_str("4h").unwrap(),
+            Card::from_str("2c").unwrap(),
+        ];
+        let game_info = make_game_info(40, 80, 1000, 0, Street::Flop, board);
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn flock_bot_raises_strong_hand_when_facing_limper() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // AKo — strong hand
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("Kc").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Someone limped (call_amount = BB = 20, no voluntary raises)
+        let mut game_info = make_game_info(20, 40, 1000, 0, Street::Preflop, vec![]);
+        game_info.num_raises = 0; // No voluntary raises yet
+        let action = bot.act(&game_info);
+        // Should raise to 3x BB = 60, not just call
+        assert!(
+            matches!(action, Action::Raise { total: 60 }),
+            "Expected raise to 60 for strong hand facing limp, got {:?}",
+            action
+        );
+    }
+
+    #[test]
+    fn flock_bot_calls_strong_hand_facing_one_raise() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // AKo — strong hand
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("Kc").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Facing one voluntary raise to 60 (3x BB)
+        let mut game_info = make_game_info(60, 80, 1000, 0, Street::Preflop, vec![]);
+        game_info.num_raises = 1; // One voluntary raise
+        assert_eq!(bot.act(&game_info), Action::Call);
+    }
+
+    #[test]
+    fn flock_bot_folds_strong_hand_facing_3bet() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        // AKo — strong hand but not premium
+        bot.hole_cards = Some(
+            HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("Kc").unwrap(),
+            )
+            .unwrap(),
+        );
+        // Facing a 3-bet to 180 (2 voluntary raises)
+        let mut game_info = make_game_info(180, 240, 1000, 0, Street::Preflop, vec![]);
+        game_info.num_raises = 2; // Two voluntary raises
+        assert_eq!(bot.act(&game_info), Action::Fold);
+    }
+
+    #[test]
+    fn flock_bot_trait_methods_are_no_ops() {
+        let mut bot = FlockBot::new(PlayerId(0), "FlockBot".to_string());
+        let game_info = make_game_info(0, 30, 1000, 0, Street::Preflop, vec![]);
+
+        bot.init(&game_info);
+        bot.game_start_event(&game_info);
+        bot.hole_cards_dealt(
+            &HoleCards::new(
+                Card::from_str("As").unwrap(),
+                Card::from_str("Kh").unwrap(),
+            )
+            .unwrap(),
+            &game_info,
+        );
+        bot.stage_event(&game_info);
+        bot.action_event(PlayerId(1), &Action::Call, &game_info);
+        bot.showdown_event(PlayerId(1), None, None, &game_info);
+        bot.game_over_event(&game_info);
+        bot.on_eliminated(3);
+    }
+}

holdem_core/src/game/bots/fold_bot.rs

@@ -127,8 +127,10 @@ mod tests {
                 is_dealer: true,
                 is_small_blind: false,
                 is_big_blind: false,
+                bankroll: 0,
             })],
             actions_this_hand: vec![],
+            num_raises: 0,
             hand_number: 1,
             active_players: 2,
         }

holdem_core/src/game/bots/mod.rs

@@ -12,11 +12,13 @@
 //! | [`FoldBot`] | Ultra-passive | Folds to any bet, checks otherwise |
 //! | [`RaiseBot`] | Ultra-aggressive | Always raises the maximum allowed amount |
 //! | [`RandomBot`] | Random | Picks a random legal action at each decision point |
+//! | [`FlockBot`] | Tight-aggressive | Plays few hands aggressively with strong holdings |
+//! | [`ChumpBot`] | Loose-passive | Calling station that rarely folds or raises |
 //!
 //! # Usage
 //!
 //! ```rust
-//! use holdem_core::game::bots::{CallBot, FoldBot, RaiseBot, RandomBot};
+//! use holdem_core::game::bots::{CallBot, FoldBot, RaiseBot, RandomBot, FlockBot, ChumpBot};
 //! use holdem_core::game::player::HoldemPlayer;
 //! use holdem_core::game::types::PlayerId;
 //!
@@ -24,15 +26,21 @@
 //! let fold_bot = FoldBot::new(PlayerId(2), "Folder".to_string());
 //! let raise_bot = RaiseBot::new(PlayerId(3), "Raiser".to_string());
 //! let random_bot = RandomBot::new(PlayerId(4), "Random".to_string());
+//! let flock_bot = FlockBot::new(PlayerId(5), "Flock".to_string());
+//! let chump_bot = ChumpBot::new(PlayerId(6), "Chump".to_string());
 //! ```
 
 pub mod call_bot;
+pub mod chump_bot;
+pub mod flock_bot;
 pub mod fold_bot;
 pub mod random_bot;
 pub mod raise_bot;
 
 // Re-export all bots at the module level for convenience.
 pub use call_bot::CallBot;
+pub use chump_bot::ChumpBot;
+pub use flock_bot::FlockBot;
 pub use fold_bot::FoldBot;
 pub use random_bot::RandomBot;
 pub use raise_bot::RaiseBot;

holdem_core/src/game/bots/raise_bot.rs

@@ -149,8 +149,8 @@ impl HoldemPlayer for RaiseBot {
                     .unwrap_or(small_bet);
 
                 // Check if raises are still allowed (typically max 3 raises per round)
-                // We approximate raises_this_round from actions
+                // Use the authoritative raise counter from GameInfo.
-                let raises_this_round = count_raises(game_info);
+                let raises_this_round = game_info.num_raises;
 
                 if !game_info.bet_limit.can_raise(game_info.street, raises_this_round) {
                     // Can't raise anymore, just call
@@ -197,30 +197,6 @@ impl HoldemPlayer for RaiseBot {
     fn on_eliminated(&self, _placement: u32) {}
 }
 
-/// Count the number of raises in the current betting round from the action history.
-///
-/// Both [`Action::Raise`] and [`Action::AllIn`] are counted as raises for the
-/// purpose of the Fixed-Limit cap check.
-fn count_raises(game_info: &GameInfo) -> usize {
-    let street_index = match game_info.street {
-        crate::Street::Preflop => 0,
-        crate::Street::Flop => 1,
-        crate::Street::Turn => 2,
-        crate::Street::River => 3,
-    };
-
-    game_info
-        .actions_this_hand
-        .get(street_index)
-        .map(|actions| {
-            actions
-                .iter()
-                .filter(|(_, a)| matches!(a, Action::Raise { .. } | Action::AllIn))
-                .count()
-        })
-        .unwrap_or(0)
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -261,8 +237,10 @@ mod tests {
                 is_dealer: true,
                 is_small_blind: false,
                 is_big_blind: false,
+                bankroll: 0,
             })],
             actions_this_hand: vec![],
+            num_raises: 0,
             hand_number: 1,
             active_players: 2,
         }
@@ -306,8 +284,10 @@ mod tests {
                 is_dealer: true,
                 is_small_blind: false,
                 is_big_blind: false,
+                bankroll: 0,
             })],
             actions_this_hand: vec![],
+            num_raises: 0,
             hand_number: 1,
             active_players: 2,
         }
@@ -347,8 +327,10 @@ mod tests {
                 is_dealer: true,
                 is_small_blind: false,
                 is_big_blind: false,
+                bankroll: 0,
             })],
             actions_this_hand: vec![],
+            num_raises: 0,
             hand_number: 1,
             active_players: 2,
         }
@@ -449,15 +431,7 @@ mod tests {
         let mut bot = RaiseBot::new(PlayerId(3), "RaiseBot".to_string());
         // Create game info with 3 raises already made on the flop (Fixed-Limit max)
         let mut game_info = make_fl_game_info(40, 100, 1000, 0, Street::Flop);
-        // Index 0 = preflop (empty), Index 1 = flop (3 raises)
+        game_info.num_raises = 3; // 3 voluntary raises already on the flop
-        game_info.actions_this_hand = vec![
-            vec![],
-            vec![
-                (PlayerId(1), Action::Raise { total: 20 }),
-                (PlayerId(2), Action::Raise { total: 30 }),
-                (PlayerId(1), Action::Raise { total: 40 }),
-            ],
-        ];
         let action = bot.act(&game_info);
         // Can't raise anymore, should call
         assert_eq!(action, Action::Call);

holdem_core/src/game/bots/random_bot.rs

@@ -59,26 +59,6 @@ impl RandomBot {
         game_info.current_bet.saturating_sub(wagered)
     }
 
-    /// Counts the number of raises in the current betting round.
-    fn count_raises_current_street(&self, game_info: &GameInfo) -> usize {
-        let street_index = match game_info.street {
-            crate::Street::Preflop => 0,
-            crate::Street::Flop => 1,
-            crate::Street::Turn => 2,
-            crate::Street::River => 3,
-        };
-
-        game_info
-            .actions_this_hand
-            .get(street_index)
-            .map(|actions| {
-                actions
-                    .iter()
-                    .filter(|(_, a)| matches!(a, Action::Raise { .. }))
-                    .count()
-            })
-            .unwrap_or(0)
-    }
 
     /// Builds a list of legal actions and picks one at random.
     ///
@@ -123,7 +103,7 @@ impl RandomBot {
         // Check if raising is possible
         let can_raise = game_info
             .bet_limit
-            .can_raise(game_info.street, self.count_raises_current_street(game_info));
+            .can_raise(game_info.street, game_info.num_raises);
 
         if can_raise && stack > call_amount {
             // Player has chips remaining after calling
@@ -274,8 +254,10 @@ mod tests {
                 is_dealer: true,
                 is_small_blind: false,
                 is_big_blind: false,
+                bankroll: 0,
             })],
             actions_this_hand: vec![],
+            num_raises: 0,
             hand_number: 1,
             active_players: 2,
         }

holdem_core/src/game/config.rs

@@ -35,6 +35,63 @@ use super::table::TableConfig;
 use super::tournament::{BlindSchedule, GameType, PrizeStructure};
 use super::types::{ChipCount, GameError, SeatIndex};
 
+// ---------------------------------------------------------------------------
+// RakeConfig
+// ---------------------------------------------------------------------------
+
+/// Rake configuration for a poker game.
+///
+/// Rake is a percentage of each pot taken by the house. It can be capped
+/// at a maximum amount per pot.
+///
+/// # Defaults
+///
+/// `percentage: 0.0`, `cap: 0` — no rake.
+#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
+pub struct RakeConfig {
+    /// Rake percentage (0.0 to 1.0). E.g., 0.05 = 5%.
+    #[serde(default)]
+    pub percentage: f64,
+    /// Maximum rake per hand (0 = no cap).
+    #[serde(default)]
+    pub cap: ChipCount,
+}
+
+impl Default for RakeConfig {
+    fn default() -> Self {
+        Self { percentage: 0.0, cap: 0 }
+    }
+}
+
+impl RakeConfig {
+    /// Creates a no-rake configuration.
+    pub fn no_rake() -> Self {
+        Self { percentage: 0.0, cap: 0 }
+    }
+
+    /// Returns `true` if rake is effectively disabled.
+    pub fn is_zero(&self) -> bool {
+        self.percentage == 0.0
+    }
+
+    /// Calculate rake for a pot of the given size.
+    ///
+    /// Returns the rake amount (floored to whole chips), capped at `self.cap`.
+    /// Clamps `percentage` to `[0.0, 1.0]` to guard against misconfiguration.
+    pub fn calculate_rake(&self, pot_amount: ChipCount) -> ChipCount {
+        if self.percentage <= 0.0 || pot_amount == 0 {
+            return 0;
+        }
+        let pct = self.percentage.min(1.0);
+        let rake = (pot_amount as f64 * pct).floor() as ChipCount;
+        if self.cap > 0 {
+            rake.min(self.cap)
+        } else {
+            rake
+        }
+    }
+}
+
 // ---------------------------------------------------------------------------
 // Default helper functions
 // ---------------------------------------------------------------------------
@@ -223,6 +280,30 @@ pub struct GameConfig {
     #[serde(default)]
     pub seed: Option<u64>,
 
+    /// Rake percentage taken from each pot at showdown (e.g., 0.05 = 5%).
+    /// Set to 0.0 (default) to disable rake.
+    #[serde(default)]
+    pub rake_percentage: f64,
+
+    /// Maximum rake in chips per pot. 0 means no cap.
+    #[serde(default)]
+    pub rake_cap: ChipCount,
+
+    /// If true, all players' stacks are reset to `starting_chips` before every hand.
+    /// Their overall profit/loss balance is tracked via `bankroll`.
+    #[serde(default)]
+    pub reset_bankroll_each_hand: bool,
+
+    /// When a player's stack drops to or below this threshold (and reset is NOT enabled),
+    /// they automatically buy back up to `starting_chips`. 0 = disabled.
+    #[serde(default)]
+    pub bankroll_refill_threshold: ChipCount,
+
+    /// If true, player seat assignments are randomized before each hand
+    /// (cash game) or before tournament start.
+    #[serde(default)]
+    pub randomize_seats: bool,
+
     /// Bot configurations.
     #[serde(default)]
     pub bots: Vec<BotConfig>,
@@ -246,6 +327,11 @@ impl Default for GameConfig {
             num_blind_levels: default_num_levels(),
             num_hands: 0,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
             bots: Vec::new(),
         }
     }
@@ -287,6 +373,14 @@ impl GameConfig {
             small_blind: self.small_blind,
             big_blind: self.big_blind,
             ante: self.ante,
+            rake_config: RakeConfig {
+                percentage: self.rake_percentage,
+                cap: self.rake_cap,
+            },
+            starting_chips: self.starting_chips,
+            reset_bankroll_each_hand: self.reset_bankroll_each_hand,
+            bankroll_refill_threshold: self.bankroll_refill_threshold,
+            randomize_seats: self.randomize_seats,
         }
     }
 
@@ -684,6 +778,12 @@ min_raise = 50
             num_blind_levels: 15,
             num_hands: 500,
             seed: Some(12345),
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![
                 BotConfig {
                     bot_type: "call_bot".to_string(),
@@ -760,6 +860,12 @@ min_raise = 50
             num_blind_levels: 15,
             num_hands: 0,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![],
         };
         let table_config = config.to_table_config();
@@ -786,6 +892,12 @@ min_raise = 50
             num_blind_levels: 5,
             num_hands: 0,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![],
         };
         let schedule = config.to_blind_schedule();
@@ -828,6 +940,12 @@ min_raise = 50
             num_blind_levels: 15,
             num_hands: 0,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![
                 BotConfig {
                     bot_type: "call_bot".to_string(),
@@ -872,6 +990,12 @@ min_raise = 50
             num_blind_levels: 20,
             num_hands: 0,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![
                 BotConfig {
                     bot_type: "bot".to_string(),
@@ -958,6 +1082,11 @@ min_raise = 20
                 num_blind_levels: 20,
                 num_hands: 0,
                 seed: Some(42),
+                rake_percentage: 0.0,
+                rake_cap: 0,
+                reset_bankroll_each_hand: false,
+                bankroll_refill_threshold: 0,
+                randomize_seats: false,
                 bots: vec![],
             },
             output: OutputConfig {

holdem_core/src/game/game_info.rs

@@ -72,8 +72,19 @@ pub struct GameInfo {
     // --- Hand history for current hand ---
     /// Actions taken so far in the current hand, grouped by street.
     /// Index 0 = preflop, 1 = flop, 2 = turn, 3 = river.
+    ///
+    /// **Meerkat convention:** On the preflop street (index 0), the small blind
+    /// and big blind postings are recorded as [`Action::Raise`] entries at the
+    /// beginning of the list. These are *not* voluntary player raises. Use
+    /// [`num_raises`](Self::num_raises) for the authoritative count of voluntary
+    /// raises on the current street, which excludes blind postings.
     pub actions_this_hand: Vec<Vec<(PlayerId, Action)>>,
 
+    // --- Action counters (authoritative, maintained by the engine) ---
+    /// Number of voluntary raises on the current street (excludes blinds).
+    /// Reset to 0 when advancing to a new street.
+    pub num_raises: usize,
+
     // --- Game metadata ---
     /// Hand number within the session.
     pub hand_number: u64,

holdem_core/src/game/hand_runner.rs

@@ -17,6 +17,7 @@ use crate::{Board, Deck, Hand, HoleCards};
 
 use super::action::{validate_action, Action};
 use super::betting::{BetLimit, BettingRound};
+use super::config::RakeConfig;
 use super::game_info::GameInfo;
 use super::player::Seat;
 use super::player_info::PlayerState;
@@ -92,6 +93,10 @@ pub struct HandResult {
     pub board: Board,
     /// Net chip movement for each player in units of chips (positive = won, negative = lost).
     pub chip_movements: HashMap<PlayerId, i64>,
+    /// Total rake deducted from all pots this hand.
+    pub total_rake: ChipCount,
+    /// Rake deducted per pot, parallel to `pot_winners`.
+    pub rake_per_pot: Vec<ChipCount>,
 }
 
 // ---------------------------------------------------------------------------
@@ -141,6 +146,8 @@ pub struct HandRunner {
     actions_this_hand: Vec<Vec<(PlayerId, Action)>>,
     /// Optional RNG seed for reproducible shuffles.
     seed: Option<u64>,
+    /// Rake configuration for this hand.
+    rake_config: RakeConfig,
 }
 
 impl HandRunner {
@@ -188,6 +195,7 @@ impl HandRunner {
                 Vec::new(),
             ],
             seed: None,
+            rake_config: RakeConfig::no_rake(),
         }
     }
 
@@ -200,6 +208,12 @@ impl HandRunner {
         self
     }
 
+    /// Sets the rake configuration for this hand.
+    pub fn with_rake_config(mut self, config: RakeConfig) -> Self {
+        self.rake_config = config;
+        self
+    }
+
     // -----------------------------------------------------------------------
     // Start the hand
     // -----------------------------------------------------------------------
@@ -279,6 +293,11 @@ impl HandRunner {
             if actual_sb > 0 {
                 self.pot_manager
                     .place_bet(self.seats[self.sb_seat_idx].player_id, actual_sb);
+                // Record SB as a raise (Meerkat convention: blinds count as raises).
+                self.actions_this_hand[0].push((
+                    self.seats[self.sb_seat_idx].player_id,
+                    Action::Raise { total: actual_sb },
+                ));
             }
         }
 
@@ -288,6 +307,11 @@ impl HandRunner {
             if actual_bb > 0 {
                 self.pot_manager
                     .place_bet(self.seats[self.bb_seat_idx].player_id, actual_bb);
+                // Record BB as a raise (Meerkat convention: blinds count as raises).
+                self.actions_this_hand[0].push((
+                    self.seats[self.bb_seat_idx].player_id,
+                    Action::Raise { total: actual_bb },
+                ));
             }
         }
 
@@ -597,53 +621,9 @@ impl HandRunner {
             .collect();
         self.pot_manager.finalize_pots(&active_ids);
 
-        // 5. Distribute.
+        // 5. Distribute and finalize (rake, chip movements, stack credit, game_over).
         let pot_winners = self.pot_manager.distribute(&hand_values);
-
+        self.finalize_result(pot_winners, hand_values)
-        // 6. Calculate chip movements (net: winnings - wagered).
-        // Use i64 internally to handle negative values.
-        let mut chip_movements_i64: HashMap<PlayerId, i64> = HashMap::new();
-        for seat in &self.seats {
-            chip_movements_i64.insert(seat.player_id, -(seat.wagered_this_hand as i64));
-        }
-        for pot_result in &pot_winners {
-            for winner in pot_result {
-                *chip_movements_i64.get_mut(&winner.player_id).unwrap() +=
-                    winner.amount as i64;
-            }
-        }
-        let chip_movements = chip_movements_i64;
-
-        // Credit winnings to stacks.
-        for pot_result in &pot_winners {
-            for winner in pot_result {
-                if let Some(seat) = self
-                    .seats
-                    .iter_mut()
-                    .find(|s| s.player_id == winner.player_id)
-                {
-                    seat.stack += winner.amount;
-                }
-            }
-        }
-
-        // 7. Call game_over_event on all players.
-        {
-            let game_info = self.build_game_info();
-            for seat in &mut self.seats {
-                seat.player.game_over_event(&game_info);
-            }
-        }
-
-        // 8. Set state to Complete.
-        self.state = HandState::Complete;
-
-        HandResult {
-            pot_winners,
-            hand_values,
-            board: self.board.clone(),
-            chip_movements,
-        }
     }
 
     // -----------------------------------------------------------------------
@@ -665,46 +645,7 @@ impl HandRunner {
             .collect();
 
         let pot_winners = self.pot_manager.distribute(&hand_values);
-
+        Ok(self.finalize_result(pot_winners, hand_values))
-        // Calculate chip movements (net: winnings - wagered).
-        let mut chip_movements_i64: HashMap<PlayerId, i64> = HashMap::new();
-        for seat in &self.seats {
-            chip_movements_i64.insert(seat.player_id, -(seat.wagered_this_hand as i64));
-        }
-        for pot_result in &pot_winners {
-            for winner in pot_result {
-                *chip_movements_i64.get_mut(&winner.player_id).unwrap() +=
-                    winner.amount as i64;
-            }
-        }
-        let chip_movements = chip_movements_i64;
-        // Credit winnings to stack.
-        for pot_result in &pot_winners {
-            for winner in pot_result {
-                if let Some(seat) = self
-                    .seats
-                    .iter_mut()
-                    .find(|s| s.player_id == winner.player_id)
-                {
-                    seat.stack += winner.amount;
-                }
-            }
-        }
-
-        // Call game_over_event on all players.
-        let game_info = self.build_game_info();
-        for seat in &mut self.seats {
-            seat.player.game_over_event(&game_info);
-        }
-
-        self.state = HandState::Complete;
-
-        Ok(HandResult {
-            pot_winners,
-            hand_values,
-            board: self.board.clone(),
-            chip_movements,
-        })
     }
 
     // -----------------------------------------------------------------------
@@ -940,8 +881,8 @@ impl HandRunner {
                     return Ok(result);
                 }
                 HandState::Complete => {
-                    // Hand was completed (e.g., by resolve_last_player_wins via step).
+                    // Hand was already resolved (e.g., by resolve_last_player_wins via step).
-                    // Reconstruct the result from the pot manager.
+                    // Stacks were already credited there — only reconstruct the HandResult.
                     let hand_values: HashMap<PlayerId, HandValue> = self
                         .seats
                         .iter()
@@ -950,24 +891,18 @@ impl HandRunner {
                         .collect();
 
                     let pot_winners = self.pot_manager.distribute(&hand_values);
+                    let (raked_winners, rake_per_pot, total_rake) = self.apply_rake(pot_winners);
 
-                    let mut chip_movements_i64: HashMap<PlayerId, i64> = HashMap::new();
+                    // Compute chip movements for the result (no stack crediting — already done).
-                    for seat in &self.seats {
+                    let chip_movements = self.compute_chip_movements(&raked_winners);
-                        chip_movements_i64.insert(seat.player_id, -(seat.wagered_this_hand as i64));
-                    }
-                    for pot_result in &pot_winners {
-                        for winner in pot_result {
-                            *chip_movements_i64.get_mut(&winner.player_id).unwrap() +=
-                                winner.amount as i64;
-                        }
-                    }
-                    let chip_movements = chip_movements_i64;
 
                     return Ok(HandResult {
-                        pot_winners,
+                        pot_winners: raked_winners,
                         hand_values,
                         board: self.board.clone(),
                         chip_movements,
+                        total_rake,
+                        rake_per_pot,
                     });
                 }
                 HandState::Idle => {
@@ -980,6 +915,134 @@ impl HandRunner {
         }
     }
 
+    // -----------------------------------------------------------------------
+    // Result finalization
+    // -----------------------------------------------------------------------
+
+    /// Computes chip movements (net: raked winnings - wagered) for each player.
+    fn compute_chip_movements(
+        &self,
+        raked_winners: &[Vec<PotWinner>],
+    ) -> HashMap<PlayerId, i64> {
+        let mut chip_movements: HashMap<PlayerId, i64> = HashMap::new();
+        for seat in &self.seats {
+            chip_movements.insert(seat.player_id, -(seat.wagered_this_hand as i64));
+        }
+        for pot_result in raked_winners {
+            for winner in pot_result {
+                *chip_movements.get_mut(&winner.player_id).unwrap() +=
+                    winner.amount as i64;
+            }
+        }
+        chip_movements
+    }
+
+    /// Credits raked winnings to player stacks.
+    fn credit_winnings(&mut self, raked_winners: &[Vec<PotWinner>]) {
+        for pot_result in raked_winners {
+            for winner in pot_result {
+                if let Some(seat) = self
+                    .seats
+                    .iter_mut()
+                    .find(|s| s.player_id == winner.player_id)
+                {
+                    seat.stack += winner.amount;
+                }
+            }
+        }
+    }
+
+    /// Finalizes a hand result: applies rake, computes chip movements, credits
+    /// stacks, fires `game_over_event`, and sets state to `Complete`.
+    ///
+    /// This is the single canonical path for hand finalization, used by both
+    /// [`showdown()`](Self::showdown) and
+    /// [`resolve_last_player_wins()`](Self::resolve_last_player_wins).
+    fn finalize_result(
+        &mut self,
+        pot_winners: Vec<Vec<PotWinner>>,
+        hand_values: HashMap<PlayerId, HandValue>,
+    ) -> HandResult {
+        // 1. Apply rake.
+        let (raked_winners, rake_per_pot, total_rake) = self.apply_rake(pot_winners);
+
+        // 2. Compute chip movements (net: winnings - wagered).
+        let chip_movements = self.compute_chip_movements(&raked_winners);
+
+        // 3. Credit winnings to stacks.
+        self.credit_winnings(&raked_winners);
+
+        // 4. Call game_over_event on all players.
+        {
+            let game_info = self.build_game_info();
+            for seat in &mut self.seats {
+                seat.player.game_over_event(&game_info);
+            }
+        }
+
+        // 5. Set state to Complete.
+        self.state = HandState::Complete;
+
+        HandResult {
+            pot_winners: raked_winners,
+            hand_values,
+            board: self.board.clone(),
+            chip_movements,
+            total_rake,
+            rake_per_pot,
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Rake
+    // -----------------------------------------------------------------------
+
+    /// Apply rake to pot distribution results.
+    ///
+    /// Returns `(raked_pot_winners, rake_per_pot, total_rake)`.
+    /// When rake is disabled, returns the input unchanged with zero rake.
+    fn apply_rake(
+        &self,
+        pot_winners: Vec<Vec<PotWinner>>,
+    ) -> (Vec<Vec<PotWinner>>, Vec<ChipCount>, ChipCount) {
+        if self.rake_config.is_zero() {
+            let total: ChipCount = 0;
+            let per_pot = vec![0; pot_winners.len()];
+            return (pot_winners, per_pot, total);
+        }
+
+        let mut total_rake: ChipCount = 0;
+        let mut rake_per_pot = Vec::with_capacity(pot_winners.len());
+
+        let raked_winners: Vec<Vec<PotWinner>> = pot_winners
+            .into_iter()
+            .map(|mut pot_result| {
+                // Sum the pot from winner amounts (they haven't been raked yet).
+                let pot_total: ChipCount = pot_result.iter().map(|w| w.amount).sum();
+                let rake = self.rake_config.calculate_rake(pot_total);
+                rake_per_pot.push(rake);
+                total_rake += rake;
+
+                // Deduct rake proportionally from each winner.
+                if rake == 0 || pot_result.is_empty() {
+                    return pot_result;
+                }
+
+                let num_winners = pot_result.len() as ChipCount;
+                let rake_per_winner = rake / num_winners;
+                let rake_remainder = rake % num_winners;
+
+                for (i, winner) in pot_result.iter_mut().enumerate() {
+                    let extra = if (i as ChipCount) < rake_remainder { 1 } else { 0 };
+                    winner.amount = winner.amount.saturating_sub(rake_per_winner + extra);
+                }
+                pot_result
+            })
+            .collect();
+
+        (raked_winners, rake_per_pot, total_rake)
+    }
+
     // -----------------------------------------------------------------------
     // Private helpers
     // -----------------------------------------------------------------------
@@ -1101,6 +1164,27 @@ impl HandRunner {
             .and_then(|id| self.find_seat_index_by_player_id(id))
             .map(|idx| self.seats[idx].index);
 
+        // Count voluntary raises on the current street (exclude blind postings).
+        // On preflop, the first two Raise entries are the SB and BB postings.
+        let street_idx = self.street_to_action_index();
+        let num_raises = self
+            .actions_this_hand
+            .get(street_idx)
+            .map(|actions| {
+                let total_raises = actions
+                    .iter()
+                    .filter(|(_, a)| matches!(a, Action::Raise { .. }))
+                    .count();
+                // On preflop, the SB and BB are recorded as raises (Meerkat convention).
+                // Subtract them to get the count of voluntary player raises.
+                if self.current_street() == Street::Preflop {
+                    total_raises.saturating_sub(2)
+                } else {
+                    total_raises
+                }
+            })
+            .unwrap_or(0);
+
         GameInfo {
             num_seats: self.seats.len() as SeatIndex,
             bet_limit: self.bet_limit,
@@ -1118,6 +1202,7 @@ impl HandRunner {
             next_to_act: next_to_act_seat,
             players,
             actions_this_hand: self.actions_this_hand.clone(),
+            num_raises,
             hand_number: self.hand_number,
             active_players: self.count_active_players(),
         }

holdem_core/src/game/mod.rs

@@ -39,7 +39,7 @@ pub use action::{Action, PlayerAction};
 pub use betting::BetLimit;
 pub use bot_factory::create_bot;
 pub use bots::{CallBot, FoldBot, RandomBot, RaiseBot};
-pub use config::{BetLimitConfig, BotConfig, GameConfig, OutputConfig, SimulationConfig};
+pub use config::{BetLimitConfig, BotConfig, GameConfig, OutputConfig, RakeConfig, SimulationConfig};
 pub use game_info::GameInfo;
 pub use hand_runner::{HandResult, HandRunner, HandState};
 pub use player::{HoldemPlayer, Seat};

holdem_core/src/game/player.rs

@@ -302,6 +302,14 @@ pub struct Seat {
     /// early fold intent; applied as [`Action::Fold`] when it becomes this
     /// player's turn.
     pub early_fold_pending: bool,
+
+    /// The player's overall balance (profit/loss) across all hands.
+    /// Starts at 0. Increases when the player wins, decreases when they lose.
+    /// When `reset_bankroll_each_hand` is enabled, this tracks the cumulative
+    /// profit/loss while the stack is reset each hand.
+    /// When `bankroll_refill_threshold` triggers a reload, the buy-in amount
+    /// is deducted from bankroll.
+    pub bankroll: i64,
 }
 
 impl Seat {
@@ -341,6 +349,7 @@ impl Seat {
             hole_cards: None,
             has_acted_this_round: false,
             early_fold_pending: false,
+            bankroll: 0,
         }
     }
 
@@ -374,6 +383,7 @@ impl Seat {
             is_dealer,
             is_small_blind,
             is_big_blind,
+            bankroll: self.bankroll,
         }
     }
 

holdem_core/src/game/player_info.rs

@@ -65,6 +65,10 @@ pub struct PlayerInfo {
 
     /// Whether this player is the big blind.
     pub is_big_blind: bool,
+
+    /// The player's overall bankroll balance across all hands.
+    /// Positive = profit, negative = loss.
+    pub bankroll: i64,
 }
 
 impl PlayerInfo {

holdem_core/src/game/simulation.rs

@@ -84,7 +84,7 @@ pub fn run_cash_game(config: &GameConfig) -> Result<(SimulationStats, Table), Ga
         }
     }
 
-    // 5. Record final stacks for accurate profit calculation.
+    // 5. Record final stacks and bankrolls for accurate profit calculation.
     let final_stacks: HashMap<PlayerId, ChipCount> = table
         .seats()
         .iter()
@@ -93,7 +93,16 @@ pub fn run_cash_game(config: &GameConfig) -> Result<(SimulationStats, Table), Ga
                 .map(|seat| (seat.player_id, seat.stack))
         })
         .collect();
-    stats.record_final_stacks(&final_stacks, &starting_stacks);
+    let bankrolls: HashMap<PlayerId, i64> = table
+        .seats()
+        .iter()
+        .filter_map(|slot| {
+            slot.as_ref()
+                .map(|seat| (seat.player_id, seat.bankroll))
+        })
+        .collect();
+    let bankroll_mode = config.reset_bankroll_each_hand || config.bankroll_refill_threshold > 0;
+    stats.record_final_stacks(&final_stacks, &starting_stacks, &bankrolls, bankroll_mode);
 
     Ok((stats, table))
 }
@@ -124,6 +133,11 @@ mod tests {
             num_blind_levels: 15,
             num_hands,
             seed,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
             bots: vec![
                 BotConfig {
                     bot_type: "call_bot".to_string(),
@@ -225,6 +239,12 @@ mod tests {
             num_blind_levels: 15,
             num_hands: 10,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![BotConfig {
                 bot_type: "call_bot".to_string(),
                 name: Some("Lonely".to_string()),
@@ -253,6 +273,12 @@ mod tests {
             num_blind_levels: 15,
             num_hands: 10,
             seed: None,
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![
                 BotConfig {
                     bot_type: "call_bot".to_string(),
@@ -289,6 +315,12 @@ mod tests {
             num_blind_levels: 15,
             num_hands: 5,
             seed: Some(99),
+            rake_percentage: 0.0,
+            rake_cap: 0,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
+
             bots: vec![
                 BotConfig {
                     bot_type: "call_bot".to_string(),

holdem_core/src/game/stats.rs

@@ -34,6 +34,10 @@ pub struct PlayerStats {
     pub biggest_pot_won: ChipCount,
     /// Stack at the end of the simulation.
     pub final_stack: ChipCount,
+    /// Total rake paid by this player across all hands.
+    pub total_rake_paid: ChipCount,
+    /// Final bankroll balance (includes refill costs and reset adjustments).
+    pub bankroll: i64,
 }
 
 impl PlayerStats {
@@ -48,6 +52,8 @@ impl PlayerStats {
             total_wagered: 0,
             biggest_pot_won: 0,
             final_stack: 0,
+            total_rake_paid: 0,
+            bankroll: 0,
         }
     }
 
@@ -96,6 +102,8 @@ pub struct SimulationStats {
     pub total_hands: u64,
     /// Game type label (e.g. `"Cash"`, `"SitAndGo"`).
     pub game_type: String,
+    /// Total rake collected across the entire simulation.
+    pub total_rake: ChipCount,
 }
 
 impl SimulationStats {
@@ -105,6 +113,7 @@ impl SimulationStats {
             players: HashMap::new(),
             total_hands: 0,
             game_type: game_type.to_string(),
+            total_rake: 0,
         }
     }
 
@@ -123,6 +132,7 @@ impl SimulationStats {
         player_names: &HashMap<PlayerId, String>,
     ) {
         self.total_hands += 1;
+        self.total_rake += result.total_rake;
 
         for (&player_id, &movement) in &result.chip_movements {
             let stats = self
@@ -148,22 +158,61 @@ impl SimulationStats {
                 }
             }
         }
+
+        // Attribute rake to pot winners proportionally.
+        for (pot_idx, pot_result) in result.pot_winners.iter().enumerate() {
+            let rake = *result.rake_per_pot.get(pot_idx).unwrap_or(&0);
+            if rake > 0 && !pot_result.is_empty() {
+                let rake_per_winner = rake / pot_result.len() as ChipCount;
+                let remainder = rake % pot_result.len() as ChipCount;
+                for (i, winner) in pot_result.iter().enumerate() {
+                    let extra = if (i as ChipCount) < remainder { 1 } else { 0 };
+                    if let Some(stats) = self.players.get_mut(&winner.player_id) {
+                        stats.total_rake_paid += rake_per_winner + extra;
+                    }
+                }
+            }
+        }
     }
 
-    /// Records the final stacks from a table into the stats.
+    /// Records the final stacks and bankrolls from a table into the stats.
     ///
     /// Call this after the simulation loop ends to set `final_stack` and
-    /// compute `total_profit` accurately (final_stack - starting_stack).
+    /// compute `total_profit` accurately.
+    ///
+    /// When `bankroll_mode` is `true`, `total_profit` is computed as
+    /// `bankroll + (final_stack - starting_stack)`, which captures all net
+    /// flows including refills and resets. When `false`, the simple
+    /// `final_stack - starting_stack` formula is used.
     pub fn record_final_stacks(
         &mut self,
         stacks: &HashMap<PlayerId, ChipCount>,
         starting_stacks: &HashMap<PlayerId, ChipCount>,
+        bankrolls: &HashMap<PlayerId, i64>,
+        bankroll_mode: bool,
     ) {
         for (&player_id, &final_stack) in stacks {
             if let Some(stats) = self.players.get_mut(&player_id) {
                 stats.final_stack = final_stack;
                 let starting = starting_stacks.get(&player_id).copied().unwrap_or(0);
-                stats.total_profit = final_stack as i64 - starting as i64;
+                let bankroll = *bankrolls.get(&player_id).unwrap_or(&0);
+                stats.bankroll = bankroll;
+                if bankroll_mode {
+                    // With bankroll tracking (reset or refill mode), `bankroll` captures
+                    // all out-of-band costs: reset deltas (stack - starting each hand) and
+                    // refill buy-in amounts. `chip_movements` from `record_hand_result`
+                    // only captures in-hand wins/losses. The two are complementary:
+                    //
+                    //   reset mode:    bankroll = Σ(stack_i - starting), final_stack == starting
+                    //                 → total_profit = bankroll + 0 = bankroll ✓
+                    //
+                    //   refill mode:   bankroll = -Σ(refill_costs), final_stack ≠ starting
+                    //                 → total_profit = -refills + (final - starting) ✓
+                    stats.total_profit = bankroll + (final_stack as i64 - starting as i64);
+                } else {
+                    // Simple mode: profit = final stack minus starting stack.
+                    stats.total_profit = final_stack as i64 - starting as i64;
+                }
             }
         }
     }
@@ -446,6 +495,8 @@ mod tests {
             hand_values: HashMap::new(),
             board: Board::new(),
             chip_movements,
+            total_rake: 0,
+            rake_per_pot: vec![],
         };
 
         sim_stats.record_hand_result(&result, &player_names);
@@ -481,6 +532,8 @@ mod tests {
                 m.insert(PlayerId(2), 0);
                 m
             },
+            total_rake: 0,
+            rake_per_pot: vec![],
         };
 
         // Hand 2: Bob wins 200
@@ -494,6 +547,8 @@ mod tests {
                 m.insert(PlayerId(2), 200);
                 m
             },
+            total_rake: 0,
+            rake_per_pot: vec![],
         };
 
         sim_stats.record_hand_result(&result1, &player_names);
@@ -530,6 +585,8 @@ mod tests {
                 m.insert(PlayerId(2), 0);
                 m
             },
+            total_rake: 0,
+            rake_per_pot: vec![],
         };
         sim_stats.record_hand_result(&result, &player_names);
 
@@ -546,7 +603,7 @@ mod tests {
             m.insert(PlayerId(2), 10000);
             m
         };
-        sim_stats.record_final_stacks(&final_stacks, &starting_stacks);
+        sim_stats.record_final_stacks(&final_stacks, &starting_stacks, &HashMap::new(), false);
 
         let alice = sim_stats.players.get(&PlayerId(1)).unwrap();
         assert_eq!(alice.final_stack, 10500);

holdem_core/src/game/table.rs

@@ -12,8 +12,10 @@
 //! `Box<dyn HoldemPlayer>`.
 
 use crate::Deck;
+use rand::SeedableRng;
 
 use super::betting::BetLimit;
+use super::config::RakeConfig;
 use super::game_info::GameInfo;
 use super::hand_runner::{HandResult, HandRunner, HandState};
 use super::player::{HoldemPlayer, Seat};
@@ -37,6 +39,16 @@ pub struct TableConfig {
     pub big_blind: ChipCount,
     /// Ante amount per hand (0 if no ante).
     pub ante: ChipCount,
+    /// Rake configuration.
+    pub rake_config: RakeConfig,
+    /// Starting chip count for each player (for resets and refills).
+    pub starting_chips: ChipCount,
+    /// If true, reset all stacks to starting_chips before each hand.
+    pub reset_bankroll_each_hand: bool,
+    /// Auto-refill threshold. 0 = disabled.
+    pub bankroll_refill_threshold: ChipCount,
+    /// If true, shuffle seat assignments before each hand.
+    pub randomize_seats: bool,
 }
 
 impl Default for TableConfig {
@@ -48,6 +60,11 @@ impl Default for TableConfig {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         }
     }
 }
@@ -74,6 +91,16 @@ pub struct Table {
     hand_number: u64,
     /// Optional RNG seed for reproducible shuffles.
     seed: Option<u64>,
+    /// Rake configuration.
+    rake_config: RakeConfig,
+    /// Starting chip count (for resets and refills).
+    starting_chips: ChipCount,
+    /// If true, reset all stacks to starting_chips before each hand.
+    reset_bankroll_each_hand: bool,
+    /// Auto-refill threshold. 0 = disabled.
+    bankroll_refill_threshold: ChipCount,
+    /// If true, shuffle seat assignments before each hand.
+    randomize_seats: bool,
 }
 
 impl Table {
@@ -85,6 +112,11 @@ impl Table {
     ///
     /// The dealer button starts at position 0. No players are seated.
     pub fn new(config: TableConfig) -> Self {
+        let rake_config = config.rake_config;
+        let starting_chips = config.starting_chips;
+        let reset_bankroll_each_hand = config.reset_bankroll_each_hand;
+        let bankroll_refill_threshold = config.bankroll_refill_threshold;
+        let randomize_seats = config.randomize_seats;
         let seats = (0..config.num_seats).map(|_| None).collect();
         Self {
             config,
@@ -93,6 +125,11 @@ impl Table {
             current_hand: None,
             hand_number: 0,
             seed: None,
+            rake_config,
+            starting_chips,
+            reset_bankroll_each_hand,
+            bankroll_refill_threshold,
+            randomize_seats,
         }
     }
 
@@ -280,8 +317,10 @@ impl Table {
 
     /// Starts a new hand.
     ///
-    /// 1. Validates enough active players (≥ 2).
+    /// 1. Validates no hand is already in progress.
-    /// 2. Validates no hand is already in progress.
+    /// 2. Validates enough active players (≥ 2).
+    /// 2.5. Bankroll management (reset/refill).
+    /// 2.7. Randomize seats if configured.
     /// 3. Advances the dealer button.
     /// 4. Takes active seats from the table and passes them to [`HandRunner`].
     /// 5. Creates a new deck and starts the hand.
@@ -297,6 +336,24 @@ impl Table {
             return Err(GameError::NotEnoughPlayers(active_count));
         }
 
+        // 2.5. Bankroll management.
+        if self.reset_bankroll_each_hand {
+            self.reset_stacks_to_starting();
+        } else if self.bankroll_refill_threshold > 0 {
+            self.refill_short_stacks();
+        }
+
+        // 2.7. Randomize seats if configured.
+        if self.randomize_seats {
+            self.shuffle_seats();
+        }
+
+        // Re-count active players after bankroll management (may have re-activated players).
+        let active_count = self.active_player_count();
+        if active_count < MIN_PLAYERS as usize {
+            return Err(GameError::NotEnoughPlayers(active_count));
+        }
+
         // 3. Advance the button.
         self.advance_button();
 
@@ -325,6 +382,9 @@ impl Table {
         if let Some(seed) = self.seed {
             runner = runner.with_seed(seed.wrapping_add(self.hand_number));
         }
+
+        // Pass rake config to runner.
+        runner = runner.with_rake_config(self.rake_config);
         
         runner.start(self.config.small_blind, self.config.big_blind, self.config.ante);
 
@@ -500,10 +560,106 @@ impl Table {
             next_to_act: None,
             players,
             actions_this_hand: vec![Vec::new(), Vec::new(), Vec::new(), Vec::new()],
+            num_raises: 0,
             hand_number: self.hand_number,
             active_players: self.active_player_count(),
         }
     }
+
+    // -----------------------------------------------------------------------
+    // Bankroll management
+    // -----------------------------------------------------------------------
+
+    /// Reset all seated players' stacks to starting_chips.
+    /// Track the change in their bankroll.
+    fn reset_stacks_to_starting(&mut self) {
+        let starting = self.starting_chips;
+        for slot in &mut self.seats {
+            if let Some(seat) = slot.as_mut() {
+                // The "cost" of resetting is the difference between
+                // starting and current stack.
+                // If they have more than starting, they profit.
+                // If they have less, they lost.
+                seat.bankroll += seat.stack as i64 - starting as i64;
+                seat.stack = starting;
+                // Re-activate sitting-out players (they have chips again).
+                if seat.state == PlayerState::SittingOut {
+                    seat.state = PlayerState::Active;
+                }
+            }
+        }
+    }
+
+    /// Refill short-stacked players up to starting_chips.
+    ///
+    /// Only refills players who are NOT SittingOut. Busted players stay out.
+    fn refill_short_stacks(&mut self) {
+        let threshold = self.bankroll_refill_threshold;
+        let starting = self.starting_chips;
+        for slot in &mut self.seats {
+            if let Some(seat) = slot.as_mut() {
+                if seat.state == PlayerState::SittingOut {
+                    continue;
+                }
+                if seat.stack <= threshold {
+                    let refill = starting.saturating_sub(seat.stack);
+                    if refill > 0 {
+                        seat.bankroll -= refill as i64;
+                        seat.stack = starting;
+                    }
+                }
+            }
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Seat randomization
+    // -----------------------------------------------------------------------
+
+    /// Randomize seat assignments by collecting all seated players,
+    /// shuffling them, and re-seating at positions 0..N.
+    ///
+    /// Resets the button to position 0 after shuffling.
+    pub fn shuffle_seats(&mut self) {
+        // 1. Collect all occupied seats.
+        let mut occupied: Vec<Seat> = self
+            .seats
+            .iter_mut()
+            .filter_map(|slot| slot.take())
+            .collect();
+
+        if occupied.len() < 2 {
+            // Put them back.
+            for (i, seat) in occupied.into_iter().enumerate() {
+                self.seats[i] = Some(seat);
+            }
+            return;
+        }
+
+        // 2. Shuffle using seeded RNG for reproducibility.
+        // Use a seed derived from the table seed + hand number.
+        let rng_seed = self.seed
+            .map(|s| s.wrapping_add(self.hand_number))
+            .unwrap_or(self.hand_number);
+        let mut rng = rand::rngs::StdRng::seed_from_u64(rng_seed);
+        use rand::seq::SliceRandom;
+        occupied.shuffle(&mut rng);
+
+        // 3. Re-seat at positions 0, 1, 2, ...
+        for (i, seat) in occupied.into_iter().enumerate() {
+            if i >= self.seats.len() {
+                // Safety: should never happen (occupied ≤ total seats), but
+                // guard against a panic if num_seats were ever reduced.
+                break;
+            }
+            let mut seat = seat;
+            seat.index = i as SeatIndex;
+            self.seats[i] = Some(seat);
+        }
+
+        // 4. Reset button to 0 since seat assignments changed.
+        self.button = 0;
+    }
 }
 
 // ---------------------------------------------------------------------------
@@ -681,6 +837,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         }
     }
 
@@ -1131,6 +1292,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         };
         let mut table = Table::new(config);
 

holdem_core/src/game/tournament.rs

@@ -694,6 +694,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         }
     }
 
@@ -869,6 +874,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         };
         let schedule = BlindSchedule::standard(1000, 10);
         let prizes = PrizeStructure::standard_sng(100, 4);
@@ -893,6 +903,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         };
         let schedule = BlindSchedule::standard(1000, 10);
         let prizes = PrizeStructure::standard_sng(100, 4);
@@ -954,6 +969,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         };
         let schedule = BlindSchedule::standard(1000, 10);
         let prizes = PrizeStructure::standard_mtt(100, 6);
@@ -999,6 +1019,11 @@ mod tests {
             small_blind: 10,
             big_blind: 20,
             ante: 0,
+            rake_config: crate::game::config::RakeConfig::no_rake(),
+            starting_chips: 10_000,
+            reset_bankroll_each_hand: false,
+            bankroll_refill_threshold: 0,
+            randomize_seats: false,
         };
         let schedule = BlindSchedule::standard(1000, 3);
         let prizes = PrizeStructure::standard_sng(100, 4);