A chess library for Python, with move generation and validation, PGN parsing and writing, Polyglot opening book reading, Gaviota tablebase probing, Syzygy tablebase probing, and UCI/XBoard engine communication

PyChess - a chess client for Linux/Windows

chess library for legal move generation, FEN/PGN parsing and more

Chess and chess variant rules and operations in TypeScript

Complete TypeScript chess engine with zero dependencies for Node.js >=24 and browsers. Features configurable AI (5 predefined difficulty levels), stateful/stateless APIs, and supports JSON and FEN formats.

C# chess library containing a complete data structure and move generation.

Predict live chess games into FEN notation.

A python script that can annotate chess games in pgn file with static evaluation or search score of an engine, can annotate an epd file with acd, acs, bm, and ce opcodes, can test engine with epd test suite and can generate chess puzzles.

Converting real images of a chessboard to FEN codes.

A high performance Python C extension for chess

Accepts FEN, PGN or array data for chess board and generates PNG or buffer.

A Rust chess library with the aim to be as feature-rich as possible

A WordPress plugin to display chess games and diagrams (using the standard FEN and PGN notations).

Programming language made up of chess games

Takes PGN as input and returns FEN

A JavaScript/TypeScript library implementing the chess game rules and providing tools to read/write the standard chess file formats.

A C11 chess engine & GUI

Chess Diagram React Component

EPD opening book generation and filtering for chess and chess variants

Lightweight and fast chess framework written in Swift.

A draughts (checkers) library for Python with move generation, PDN reading and writing, engine communication and balloted openings

Puzzle generator for chess variants

Extract the FEN out of images of chess, xiangqi, or shogi diagrams.

A library that converts a chess pgn file into a tabulated CSV data set.

A low-resource chess engine for MCUs

Chess engine, AI, cli interface, and websocket client ♞

opening books for chess variants in EPD format for engine testing and tuning, generated with https://github.com/fairy-stockfish/bookgen

Python package that converts digital chessboard image into Forsyth-Edwards (FEN) notation.

A java chess library for generating legal chess moves, determining check / mate / draw, determining the chess opening. Supports SAN, FAN, LAN, UCI and PGN.

Chessboard Widget for Flutter