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Chess engine

For this project I only used Stockfish as my chess engine, but if you like, you can also use Leela Chess Zero (Lc0). Although Lc0 is stronger than Stockfish in real life, it requires a GPU to perform well. Unfortunately I don't have that, and Lc0 will play very weak.

First build the project

$> yarn build

then run it

$> yarn run:sf

or

$> yarn run:lc0

Build docker images

$> docker build -t scaljeri/stockfish:x.x.x -f ./sf/Dockerfile-sf .

or

$> docker build -t scaljeri/lc0:x.x.x -f ./lc0/Dockerfile .

run it like

$> docker run --rm --interactive jeanluca/stockfish:latest

Checkout sf-runner.ts to see how its used by my NestJS backend. For example, you can increase the number of CPUs there. Also, to improve game play even more, you can modify the chess engine settings here.

BTW, the nestJS entrypoint for my frontend to send moves to is located here

Usage

If you run the stockerfish container manually you can fire commands yourself as follows:

$> uci
$> ucinewgame
$> position startpos
$> position fen r1k4r/p2nb1p1/2b4p/1p1n1p2/2PP4/3Q1NB1/1P3PPP/R5K1 b - c3 0 19
$> go btime 30000 wtime 30000 winc 2000 binc 2000
$> go

or $> go depth 15

or

$> go movetime 300000 // 5 minute

or ucinewgame position startpos moves e2e4 go bestmove d7d5 ponder e4e5 go ponder position startpos moves e2e4 d7d5 e4e5

Complex example

ucinewgame
position fen r2qkb1r/pp3ppp/2n2n2/6B1/3pN1b1/P7/1PP1BPPP/R2QK1NR b KQkq - 0 10
go wtime 600000 winc 1000 btime 600000 binc 1000
    bestmove g4f5 ponder e4d2
go ponder wtime 98123 winc 1000 btime 100000 binc 1000
go ponder wtime 600000 btime 600000
ponderhit

Bookmarks

UCI protocol: http://wbec-ridderkerk.nl/html/UCIProtocol.html