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Example code of p-chess/chess

Informations about the package chess

Chess

Chess is a PHP chess library that is used for chess move generation/validation, piece placement/movement, and check/checkmate/stalemate detection - basically everything but the AI.

NOTE: this started as a port of chess.js for php, forked from ryanhs/chess.php

Latest Stable Version MIT License

Installation

use composer with composer require p-chess/chess or put in your composer.json

Example Code

The code below plays a complete game of chess ... randomly.

Supported output formats

ASCII

Pieces are displayed with corresponding codes (e.g. "p" for pawn, "q" for queen, etc.).

Unicode

Pieces are displayed like in the example above.

PNG Image

Pieces are displayed inside a png image.

See dedicated documentation for a detailed instructions.

HTML

Pieces are displayed inside an HTML table.

See dedicated documentation for a detailed instructions.

Performance

There is still a lot to do in this topic.
akondas/php-grandmaster is a good place to start experiment ;)

Chess::move()

iteration mean comment
1 548.819μs initial
2 447.973μs replace fen with json_encode in history position (inThreefoldRepetition cache)
3 340.375μs replace fen with json_encode in generateMoves
4 333.145μs add boardHash calculation on make/undo move
5 25.917μs :fire: add cache for moveToSAN method

Other documentation

All classes are documented in the docs directory.

All versions of chess with dependencies

PHP Build Version
Package Version
Requires php Version ^7.4 || ^8.0
ext-ctype Version *
ext-json Version *
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