a3c48fd50c
Now there is a method to turn a chess object into a fen-string. Additionally the enPassant handling was changed. There can be only one enPassant field at a time. So a new attribute was added to the chess object that stores the field for the enPassant capture. If there is no enPassant field it will be set to -1.
ychess
Attention: The Chess engine is not finished yet.
ychess is a chess implementation and engine written in nim.
Usage
To play chess in the commandline simply download the code and run nim c -r game.nim.
You can either play the 1v1 hotseat mode or a single player mode vs the engine.
Lichess
ychess uses the lichess api with the python plugin berserk. An instance of the engine occasionally plays on lichess. To get into the whitelist just write a ingame message to the account.
Testing
Testing is done by einheit by jyapayne.
All legal chess moves are implemented in chess.nim and tested by the TestSuite
in test.nim.
You can simply run the tests with nim c -r test.nim.
Documentation
Documentation is written into the code via DocGen.
For this reason it is not saved in this repository.
To extract it into html run nim doc --project --index:on --outdir:htmldocs game.nim
Moves
Moves are read from the commandline as pure coordinate notation. The inner program will convert this notation to a move-tuple.
Board Representation
Due to easier off the board checking a 10x12 board is used.
Engine
The engine uses a simple implementation of the NegaMax-algorithm with Alpha-Beta-Pruning. For the evaluation function each piece has a corresponding value. Additionally there are piece-square tables to encurage putting pieces on active squares.