This tool will help you approximate your winning chance in a Texas Holdem poker game. There is a web front end for this tool at here

Without a doubt, luck plays a significant role here, but stepping into the game without a good mathematical foundation is equivalent to doing charity. I hope my codes can do a little help preparing you on that aspect ☺

Install rustup if you have not done so. Then build the program with

cargo build

You need wasm-pack

wasm-pack build --target web

Output would be at pkg folder, install it using npm install ./path/to/pkg/

Run the program with

cargo run -- <Community Cards> <Your Hand> [Their Hand]
# Example
cargo run -- 2s3s4d6s7s AsAd KsQs
cargo run -- 2s3s4d AsAd
cargo run -- 2s3s4d3d AsAd
# or you can run it directly like this
./poker-solver 2s3s4d3d AsAd

• Community cards consist of 3-5 cards
• Your hand consist of 2 cards
• Their hand consist of 0-2 cards

Card notation

• A card represented by 2 characters, card rank and card suit
• Card rank can accept 23456789TJQKA
• Card suit can accept scdh, stand for Spade ♠, Club ♣, Diamond ♦, Heart ♥

The program will output all possible game outcomes. Here is an example:

🎴 Community cards:       2♠3♠7♠
🎴 Your hand:               A♠A♦
🎴 Their hand:

👑 Win:                   976740
💸 Lose:                   92820
🤝 Tie:                      630
🧮 You win:            91.26791%

I use some bit math to match given hand of cards to a set of precomputed patterns. Then rank the hand accordingly. Kindly check src/poker/evaluator.rs for single game evaluation algorithm. Kindly check src/poker/game.rs for outcome simulation algorithm.

Here are the number of possible outcome in each given game phase

Here are some tests I made, you can run those tests yourself with

cargo test

• The program perform relatively well given the large number of possibilites
• With wasm version, expect 2~4 times slower (which is ~16 seconds worse case, still acceptable by my standard)