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Python3 Chess AI

Can beat me at bullet, maybe rated 1200-1400. Search is 3-ply full with a 5-ply beam(x10).

Nice TODO

  • Value function in play.py/ClassicValuator, plenty of room for improvement.
  • Add Quiescence search to play decent endgame
  • Is there a bug which allows draws to happen?

Usage

 pip3 install python-chess torch torchvision numpy flask
 # then...
 ./play.py   # runs webserver on localhost:5000

Or with pypy (for max speed)

 pip_pypy install python-chess flask
 pypy ./play.py
 # web browse to localhost:5000

TODOs

  • Roll out search beyond 1-ply
  • Make trainer multi GPU
  • Train on more data
  • Add RL self play learning support

Implementation

A simple 1 look ahead neural network value function. The trained net is in nets/value.pth. It takes in a serialized board and outputs a range from -1 to 1. -1 means black is win, 1 means white is win.

Serialization

We serialize the board into a 8x8x5 bitvector. See state.py for how.

Training Set

The value function was trained on 5M board positions from http://www.kingbase-chess.net/