vampcheah / poker-simulator

Poker simulation and evaluation tool

Poker Simulator

Getting started

The latest build is live at https://poker.lamsaoquenem.day/

Building locally

I use Svelte Kit to build this. You can build and run the application with

npm run start

Optionally you can run tests with

npm test

Then open this http://localhost:5173/ in your browser

Motivation

This tool will help you approximate your winning chance in a Texas Holdem poker game. Kindly set a board, click Compute, and let the computer do the hard work for you.

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 ☺.

Methodology

Hand evaluation

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/lib/poker/special-hands.js for pattern building algorithm. Kindly check src/lib/poker/compare.js for hands comparing/ranking algorithm.

Combinations

Since the total combinations are so big, traversing every possibility is not realistic (especially when my programming language is not very fast). I use Monte Carlo method to get the approximate result. Here is how many outcomes may happen in any round

	Flop (2 hidden cards)	Turn (1 hidden card)	River (All cards visible)
Possible Outcomes	1070190	45540	990

Learn more

I have written a 5x faster version of this simulation (can realistically simulate all 10^6 outcomes in 30 seconds). Check this out https://github.com/hucancode/poker-solver