ECHECS

TypeScript chess libraries following FIDE rules. Strict types, zero dependencies, ESM-only.

Package	Description
`@echecs/position`	Chess position type and board utilities	docs
`@echecs/fen`	Parse and stringify FEN chess positions
`@echecs/san`	Parse, resolve, and stringify SAN chess moves
`@echecs/pgn`	PGN parser with comments, variations, NAGs, and annotations
`@echecs/game`	Chess game engine with legal move generation and undo/redo	docs
`@echecs/zobrist`	Polyglot standard Zobrist hash keys for chess positions

Package	Description
`@echecs/uci`	UCI engine wrapper for communicating with Stockfish and others		docs

Package	Description
`@echecs/elo`	ELO rating system following FIDE rules		docs

Package	Description
`@echecs/swiss`	Swiss tournament pairing and standings following FIDE rules	docs
`@echecs/round-robin`	Round-robin pairings following FIDE Berger tables
`@echecs/tournament`	Stateful tournament orchestrator for any FIDE pairing system	docs

Package	Description
`@echecs/buchholz`	Buchholz tiebreak family (Cut, Median, Average, Fore)
`@echecs/sonneborn-berger`	Sonneborn-Berger tiebreak
`@echecs/progressive`	Progressive score tiebreak
`@echecs/koya`	Koya tiebreak for round-robin tournaments
`@echecs/direct-encounter`	Direct encounter tiebreak
`@echecs/number-of-wins`	Win-counting tiebreaks (Wins, Black Wins, Standard Points)
`@echecs/average-rating`	Average Rating of Opponents tiebreak
`@echecs/performance-rating`	Performance rating tiebreaks (TPR, Perfect TPR)

Package	Description
`@echecs/react-board`	React chessboard with drag & drop, animation, and theming		docs
`@echecs/react-movesheet`	React move notation panel with click navigation and variations

Package	Description
`@echecs/trf`	FIDE Tournament Report File (TRF) parser		docs
`@echecs/tunx`	SwissManager TUNX binary file parser/serializer

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