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Example code of cmuset/chess-tools

Informations about the package chess-tools

ChessTools

A PHP library for parsing and exporting chess notations: PGN, SAN, and FEN.

Table of Contents

  1. Installation
  2. Quick Start
  3. Tools
  4. Model Layer
  5. Enums Reference
  6. Testing & Development

Installation

Requires PHP >= 8.4.

Quick Start

Tools

Parsers — docs/tools/parser.md

Convert strings into model objects.

Class Input Output
PGNParser PGN string Game or Game[]
SANParser SAN string + color Move
FENParser FEN string Position

Exporters — docs/tools/exporter.md

Serialize model objects back to strings.

Class Input Output
GameExporter Game or Variation PGN string
MoveExporter Move SAN string
PositionExporter Position FEN string

MoveApplier — docs/tools/move-applier.md

Applies a Move to a Position, enforcing all chess rules: castling rights, en passant, promotion, counters, and post-move check validation.

Validators — docs/tools/validator.md

Check positions and games for illegal states.

Class Validates
PositionValidator A single Position (kings, check, pawns, en passant)
GameValidator A full Game — replays every move including sub-variations

Resolvers — docs/tools/resolver.md

Derive information absent from raw SAN: source squares, capture flags, and check/checkmate markers.

Class Resolves
MoveResolver A single Move against a Position
VariationResolver All moves in a Variation sequentially
GameResolver The full game main line + result detection

VariationSplitter — docs/tools/splitter.md

Extracts all nested variations into a flat list of independent Variation objects, each prefixed with the moves preceding the divergence.

VariationMerger — docs/tools/merger.md

Merges Variation objects back into a main line, inserting diverging moves as nested sub-variations at the correct branching points.

Model Overview

Class Description Docs
Game Full PGN game: tags, initial position, main line, result →
Position Board state: pieces, side to move, castling rights, en passant, counters →
Variation Ordered collection of MoveNode instances, keyed by "1." / "1..." notation →
MoveNode Node in the move tree: move + move number + comments + NAGs + sub-variations →
Move Parsed SAN move: piece, destination, flags (capture, check, castling, promotion) →
Square A board square: coordinates + optional piece →

Enums Reference

All domain concepts are PHP string-backed enums.

Enum Values Docs
ColorEnum WHITE 'w' · BLACK 'b' →
PieceEnum WHITE_KING 'K' … BLACK_PAWN 'p' (12 cases) →
CoordinatesEnum A1 'a1' … H8 'h8' (64 cases) →
CastlingEnum WHITE_KINGSIDE 'K' · WHITE_QUEENSIDE 'Q' · BLACK_KINGSIDE 'k' · BLACK_QUEENSIDE 'q' →
ResultEnum WHITE_WINS '1-0' · BLACK_WINS '0-1' · DRAW '1/2-1/2' · ONGOING '*' →

Testing & Development

Or with Docker:

MIT License. See LICENSE.

All versions of chess-tools with dependencies

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