Repositories list

• Fairy-Stockfish

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

  board-gamechessusi+ 13

  board-gamechessusiucixboardstockfishshogixiangqichinese-chessjanggi+ 6

  C++

  •

  GNU General Public License v3.0

  •287287 forks in fairy-stockfish/Fairy-Stockfish•921921 stars in fairy-stockfish/Fairy-Stockfish•128128 issues in fairy-stockfish/Fairy-Stockfish•3434 pull requests in fairy-stockfish/Fairy-Stockfish•Updated Oct 13, 2026Oct 13, 2026

• Fairy-Stockfish-NNUE

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

  stockfishxiangqijanggi+ 3

  stockfishxiangqijanggimakrukfairy-stockfishnnue

  GNU General Public License v3.0

  •1616 forks in fairy-stockfish/Fairy-Stockfish-NNUE•5454 stars in fairy-stockfish/Fairy-Stockfish-NNUE•00 issues in fairy-stockfish/Fairy-Stockfish-NNUE•00 pull requests in fairy-stockfish/Fairy-Stockfish-NNUE•Updated Oct 2, 2026Oct 2, 2026

• fairyfishtest

  Public
  CECP/xboard variant engine matches (e.g., for bughouse)

  xboardchess-variantsbughouse+ 2

  xboardchess-variantsbughousefairy-stockfishcecp

  Python

  •

  GNU General Public License v3.0

  •11 fork in fairy-stockfish/fairyfishtest•11 star in fairy-stockfish/fairyfishtest•33 issues in fairy-stockfish/fairyfishtest•00 pull requests in fairy-stockfish/fairyfishtest•Updated Oct 1, 2026Oct 1, 2026

• variantfishtest

  Public
  variant-agnostic UCI chess variant engine matches

  ucichess-variantsfairy-stockfish

  ucichess-variantsfairy-stockfish

  Python

  •

  GNU General Public License v3.0

  •99 forks in fairy-stockfish/variantfishtest•1010 stars in fairy-stockfish/variantfishtest•00 issues in fairy-stockfish/variantfishtest•00 pull requests in fairy-stockfish/variantfishtest•Updated Oct 1, 2026Oct 1, 2026

• fairy-stockfish.wasm

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

  wasmstockfishshogi+ 3

  wasmstockfishshogixiangqichess-variantsfairy-stockfish

  C++

  •

  GNU General Public License v3.0

  •6767 forks in fairy-stockfish/fairy-stockfish.wasm•4242 stars in fairy-stockfish/fairy-stockfish.wasm•11 issue in fairy-stockfish/fairy-stockfish.wasm•00 pull requests in fairy-stockfish/fairy-stockfish.wasm•Updated Sep 28, 2026Sep 28, 2026

• variant-nnue-tools

  Public
  Variant NNUE training data generator for Fairy-Stockfish

  chess-variantsfairy-stockfishnnue

  chess-variantsfairy-stockfishnnue

  C++

  •

  GNU General Public License v3.0

  •1616 forks in fairy-stockfish/variant-nnue-tools•2020 stars in fairy-stockfish/variant-nnue-tools•44 issues in fairy-stockfish/variant-nnue-tools•00 pull requests in fairy-stockfish/variant-nnue-tools•Updated Sep 25, 2026Sep 25, 2026

• bookgen

  Public
  EPD opening book generation and filtering for chess and chess variants

  chessfenstockfish+ 4

  chessfenstockfishepdopening-bookchess-variantsfairy-stockfish

  C++

  •

  GNU General Public License v3.0

  •77 forks in fairy-stockfish/bookgen•2626 stars in fairy-stockfish/bookgen•11 issue in fairy-stockfish/bookgen•00 pull requests in fairy-stockfish/bookgen•Updated Sep 25, 2026Sep 25, 2026

• variant-nnue-pytorch

  Public
  chess variant NNUE training code for Fairy-Stockfish

  board-gameshogixiangqi+ 4

  board-gameshogixiangqicrazyhousechess-variantsfairy-stockfishnnue

  Python

  •3030 forks in fairy-stockfish/variant-nnue-pytorch•4444 stars in fairy-stockfish/variant-nnue-pytorch•77 issues in fairy-stockfish/variant-nnue-pytorch•22 pull requests in fairy-stockfish/variant-nnue-pytorch•Updated Sep 22, 2026Sep 22, 2026

• chess-variant-standards

  Public
  documentation of de facto standards for chess variants

  usipgnfen+ 5

  usipgnfenucisanchess-variantsuccifairy-stockfish

  SCSS

  •00 forks in fairy-stockfish/chess-variant-standards•77 stars in fairy-stockfish/chess-variant-standards•00 issues in fairy-stockfish/chess-variant-standards•00 pull requests in fairy-stockfish/chess-variant-standards•Updated Sep 19, 2026Sep 19, 2026

• fairy-stockfish.github.io

  Public
  Fairy-Stockfish website

  jekyllgithub-pages-websitechess-variants+ 1

  jekyllgithub-pages-websitechess-variantsfairy-stockfish

  HTML

  •55 forks in fairy-stockfish/fairy-stockfish.github.io•22 stars in fairy-stockfish/fairy-stockfish.github.io•11 issue in fairy-stockfish/fairy-stockfish.github.io•00 pull requests in fairy-stockfish/fairy-stockfish.github.io•Updated Sep 19, 2026Sep 19, 2026

• varfishtest-archive

  Public
  Archive of the Fairy-Stockfish variant fishtest results

  Python

  •00 forks in fairy-stockfish/varfishtest-archive•00 stars in fairy-stockfish/varfishtest-archive•00 issues in fairy-stockfish/varfishtest-archive•00 pull requests in fairy-stockfish/varfishtest-archive•Updated Sep 2, 2026Sep 2, 2026

• skills

  Public
  agent skills related to Fairy-Stockfish

  agent-skills

  agent-skills

  MIT License

  •00 forks in fairy-stockfish/skills•00 stars in fairy-stockfish/skills•00 issues in fairy-stockfish/skills•00 pull requests in fairy-stockfish/skills•Updated Jan 30, 2026Jan 30, 2026

• .github

  Public
  Fairy-Stockfish organization readme

  chess-variantsfairy-stockfish

  chess-variantsfairy-stockfish

  00 forks in fairy-stockfish/.github•00 stars in fairy-stockfish/.github•00 issues in fairy-stockfish/.github•00 pull requests in fairy-stockfish/.github•Updated Oct 30, 2025Oct 30, 2025

• spsa

  Public
  SPSA tuner for UCI chess variant engines

  stockfishspsachess-variants+ 1

  stockfishspsachess-variantsfairy-stockfish

  Perl

  •

  GNU General Public License v3.0

  •1313 forks in fairy-stockfish/spsa•55 stars in fairy-stockfish/spsa•00 issues in fairy-stockfish/spsa•00 pull requests in fairy-stockfish/spsa•Updated Oct 30, 2025Oct 30, 2025

• books

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

  fenepdopening-book+ 2

  fenepdopening-bookchess-variantsfairy-stockfish

  GNU General Public License v3.0

  •88 forks in fairy-stockfish/books•1414 stars in fairy-stockfish/books•00 issues in fairy-stockfish/books•00 pull requests in fairy-stockfish/books•Updated Oct 20, 2025Oct 20, 2025

• fairy-sf-discord

  Public
  Fairy-Stockfish discord bot

  discordchess-variantsfairy-stockfish

  discordchess-variantsfairy-stockfish

  Python

  •11 fork in fairy-stockfish/fairy-sf-discord•00 stars in fairy-stockfish/fairy-sf-discord•00 issues in fairy-stockfish/fairy-sf-discord•00 pull requests in fairy-stockfish/fairy-sf-discord•Updated Aug 5, 2025Aug 5, 2025

• FairyFishGUI

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

  chesschess-variantsfairy-stockfish

  chesschess-variantsfairy-stockfish

  Python

  •

  GNU Lesser General Public License v2.1

  •1010 forks in fairy-stockfish/FairyFishGUI•1717 stars in fairy-stockfish/FairyFishGUI•00 issues in fairy-stockfish/FairyFishGUI•00 pull requests in fairy-stockfish/FairyFishGUI•Updated Feb 29, 2024Feb 29, 2024