chess variant engine supporting Xiangqi, Shogi, Janggi, Makruk, S-Chess, Crazyhouse, Bughouse, and many more

A highly customizable way to play chess in your terminal. Play online (via Lichess.org) and offline against the Fairy-Stockfish engine. All Lichess variants are supported.

Advanced Chess Assistance System for Chess.com, Lichess.org, Pychess.org and more. Hassle-free 1-click install, no downloading. All devices and browsers supported.

Fairy-Stockfish releases with built-in NNUE (neural network) for Xiangqi, Janggi, and Makruk

chess variant NNUE training code for Fairy-Stockfish

playground for Fairy-Stockfish in the browser

WebAssembly port of the chess variant engine Fairy-Stockfish with NNUE support

EPD opening book generation and filtering for chess and chess variants

Calculate game statistics for chess variants

An interface for chess variants,can also apply Katago and Fairy-Stockfish to analyze games.

Minimalistic chess variant GUI for Fairy-Stockfish, superseded by fairyground

Variant NNUE training data generator for Fairy-Stockfish

Puzzle generator for chess variants

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

variant-agnostic UCI chess variant engine matches

documentation of de facto standards for chess variants

MCTS/UCT search for chess variants

SPSA tuner for UCI chess variant engines

Demo frontend for Fairy-Stockfish running with WebAssembly

distributed chess variant engine testing