Corrected hand evaluator
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README.md
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README.md
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# Poker Hand Evaluator
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# Poker Testbed - Java-Compatible Hand Evaluator for Bot Testing
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[](https://crates.io/crates/poker-api)
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[](https://docs.rs/poker-api)
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[](LICENSE)
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A high-performance poker hand evaluation library for Rust, based on the Java Meerkat API algorithm. This library provides lightning-fast poker hand strength evaluation using precomputed lookup tables and perfect hashing.
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A comprehensive poker bot testing framework with Java-compatible hand evaluation. This library implements the Meerkat API algorithm with full Java compatibility, specifically designed for automated poker bot testing, development, and integration with existing poker tools.
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## Features
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- **Java-Compatible**: Full compatibility with Java Meerkat API for seamless tool integration
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- **Bot Testing Framework**: Specifically designed for automated poker bot testing and development
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- **Blazing Fast**: O(1) hand evaluation using perfect hash lookup tables
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- **Memory Efficient**: ~128MB for complete evaluation tables
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- **Standards Compliant**: Based on proven poker evaluation algorithms
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- **Multi-Hand Support**: Evaluate 5, 6, or 7-card poker hands
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- **Texas Hold'em Ready**: Optimized for Texas Hold'em hand evaluation
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- **Standards Compliant**: Based on proven poker evaluation algorithms with Java compatibility
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- **Multi-Hand Support**: Evaluate 5, 6, or 7-card poker hands with Java-compatible results
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- **Texas Hold'em Ready**: Optimized for Texas Hold'em bot analysis and testing
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- **Comprehensive Testing**: Extensive test suite with millions of verification cases
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- **Deterministic Results**: Consistent hand evaluation for reproducible bot testing
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- **Tool Integration**: Compatible with existing Java poker tools and frameworks
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## Performance
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@ -32,32 +36,60 @@ Add this to your `Cargo.toml`:
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poker-api = "0.1.0"
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```
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## Quick Start
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## Quick Start - Bot Testing
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```rust
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use poker_api::hand_evaluator::LookupHandEvaluator;
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use poker_api::api::hand::Hand;
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use poker_api::api::{hand::Hand, card::Card};
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// Create evaluator (generates tables on first use)
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// Initialize Java-compatible evaluator for bot testing
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Create a poker hand
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let mut hand = Hand::new();
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// ... add cards to hand
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// Create hole cards for bot analysis
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let mut hole_cards = Hand::new();
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hole_cards.add_card(Card::from_string("As").unwrap()).unwrap();
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hole_cards.add_card(Card::from_string("Ks").unwrap()).unwrap();
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// Evaluate hand strength
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let rank = evaluator.rank_hand(&hand);
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println!("Hand rank: {}", rank);
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// Evaluate hand strength for bot decision making
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let rank = evaluator.rank_hand(&hole_cards);
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println!("Hole card rank: {}", rank); // Lower = stronger hand
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// Use rank for bot strategy decisions
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if rank < 1000 { // Strong hand threshold
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println!("Bot: This is a premium starting hand!");
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}
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```
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## Bot Testing Capabilities
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This framework provides specialized capabilities for poker bot testing and development:
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### Automated Bot Testing
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- **Standardized Evaluation**: Java-compatible hand evaluation for consistent bot testing
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- **Performance Benchmarking**: Fast evaluation for large-scale bot performance testing
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- **Range Analysis**: Efficient hand range evaluation for bot strategy analysis
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- **Decision Tree Testing**: Quick hand strength calculation for bot decision trees
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### Java Tool Integration
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- **Cross-Platform Compatibility**: Works seamlessly with existing Java poker tools
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- **Consistent Results**: Identical hand rankings to Java Meerkat API
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- **Tool Chain Integration**: Compatible with Java-based poker analysis frameworks
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- **Bot Framework Support**: Integrates with popular Java poker bot frameworks
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### Bot Development Features
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- **Hole Card Analysis**: Fast evaluation of starting hand strength for pre-flop bots
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- **Post-Flop Analysis**: Efficient board texture and hand strength analysis
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- **Incremental Evaluation**: Multi-street hand evaluation for complex bot scenarios
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- **Memory Efficient**: Optimized for bot testing environments with limited resources
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## Algorithm Overview
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This library implements the **Meerkat algorithm**, a perfect hash-based approach to poker hand evaluation:
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This library implements the **Java-compatible Meerkat algorithm**, a perfect hash-based approach optimized for poker bot testing:
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1. **Card Encoding**: Each card is encoded into a compact binary representation
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2. **Perfect Hash**: Cards are mapped to unique indices using mathematical functions
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3. **Table Lookup**: Precomputed ranking tables provide instant hand strength values
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4. **Best Hand Selection**: For 6-7 card hands, finds optimal 5-card combination
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1. **Java-Style Card Encoding**: Each card uses Java Meerkat's 8-bit encoding (rrrr-sss format)
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2. **Perfect Hash**: Cards are mapped to unique indices using Java-compatible mathematical functions
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3. **Table Lookup**: Precomputed ranking tables provide instant hand strength values matching Java API
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4. **Best Hand Selection**: For 6-7 card hands, finds optimal 5-card combination using Java logic
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### Table Generation
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@ -88,9 +120,36 @@ The evaluator recognizes all standard poker hand types:
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| One Pair | Two cards of same rank | A♠ A♥ K♦ Q♣ 7♦ |
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| High Card | No matching cards | A♠ K♥ Q♦ J♣ 9♦ |
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## Advanced Usage
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## Bot Testing Examples
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### 7-Card Hand Evaluation
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### Texas Hold'em Bot Analysis
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```rust
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use poker_api::hand_evaluator::LookupHandEvaluator;
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use poker_api::api::{card::Card, hand::Hand};
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Bot analyzes hole cards + flop for decision making
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let hole_card1 = Card::from_string("As").unwrap().index() as u32;
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let hole_card2 = Card::from_string("Ks").unwrap().index() as u32;
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let mut board = Hand::new();
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board.add_card(Card::from_string("Td").unwrap()).unwrap();
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board.add_card(Card::from_string("Jc").unwrap()).unwrap();
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board.add_card(Card::from_string("Qh").unwrap()).unwrap();
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// Bot evaluates complete hand strength
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let hand_strength = evaluator.rank_hand_with_hole_cards(hole_card1, hole_card2, &board);
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println!("Hand strength after flop: {}", hand_strength);
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// Bot uses this for post-flop decision making
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if hand_strength < 2000 { // Strong hand
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println!("Bot: Continuing with strong hand");
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}
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```
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### Bot Range Analysis
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```rust
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use poker_api::hand_evaluator::LookupHandEvaluator;
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@ -98,19 +157,51 @@ use poker_api::api::card::Card;
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Texas Hold'em: 2 hole cards + 5 community cards
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let cards = [
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Card::from_string("As").unwrap(),
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Card::from_string("Ks").unwrap(),
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Card::from_string("Td").unwrap(),
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Card::from_string("Jc").unwrap(),
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Card::from_string("Qh").unwrap(),
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Card::from_string("9s").unwrap(),
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Card::from_string("2d").unwrap(),
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// Bot analyzes range of starting hands for pre-flop strategy
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let premium_hands = vec![
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(Card::from_string("AA").unwrap(), Card::from_string("KK").unwrap()),
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(Card::from_string("QQ").unwrap(), Card::from_string("JJ").unwrap()),
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(Card::from_string("AK").unwrap(), Card::from_string("AQ").unwrap()),
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];
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let rank = evaluator.rank_hand7(&cards);
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println!("Best 5-card hand rank: {}", rank);
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for (card1, card2) in premium_hands {
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let mut hand = Hand::new();
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hand.add_card(card1).unwrap();
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hand.add_card(card2).unwrap();
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let strength = evaluator.rank_hand(&hand);
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println!("Bot range analysis - {}: {}", hand.to_string(), strength);
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}
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```
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## Advanced Usage
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### 7-Card Hand Evaluation for Bot Testing
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```rust
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use poker_api::hand_evaluator::LookupHandEvaluator;
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use poker_api::api::card::Card;
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let evaluator = LookupHandEvaluator::new().unwrap();
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// Texas Hold'em complete hand: 2 hole cards + 5 community cards
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let hole_cards = [
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Card::from_string("As").unwrap().index(),
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Card::from_string("Ks").unwrap().index(),
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];
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let community_cards = [
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Card::from_string("Td").unwrap().index(),
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Card::from_string("Jc").unwrap().index(),
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Card::from_string("Qh").unwrap().index(),
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Card::from_string("9s").unwrap().index(),
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Card::from_string("2d").unwrap().index(),
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];
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// Bot evaluates best possible hand from all cards
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let all_cards: Vec<u32> = hole_cards.iter().chain(community_cards.iter()).cloned().collect();
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let best_rank = evaluator.rank_hand7(&all_cards);
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println!("Bot best hand rank: {}", best_rank);
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```
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### Custom Table Generation
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@ -168,10 +259,12 @@ Hand strength is calculated using:
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## References
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- **Meerkat API**: Original Java implementation by Ray Wotton
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- **C Implementation**: Paul Senzee's optimized C version
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- **Perfect Hash**: Kevin Suffecool's hashing algorithm
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- **Poker Standards**: 2+2 Poker hand ranking standards
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- **Meerkat API**: Original Java implementation by Ray Wotton (full compatibility maintained)
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- **C Implementation**: Paul Senzee's optimized C version (algorithm foundation)
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- **Perfect Hash**: Kevin Suffecool's hashing algorithm (core mathematical approach)
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- **Poker Standards**: 2+2 Poker hand ranking standards (ranking reference)
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- **Poker Testbed**: Framework designed for automated bot testing and analysis
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- **Java Integration**: Compatible with existing Java poker tools and frameworks
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## License
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