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pychess-variants is a free, open-source chess server designed to play chess variants.

Currently supported games are:

• Makruk
• Makpong
• Ouk Chatrang
• Sittuyin
• ASEAN Chess
• Shogi
• Minishogi
• Kyoto shogi
• Dobutsu shogi
• Goro-Goro shogi
• Tori Shogi
• Xiangqi
• Manchu
• Janggi
• Minixiangqi
• Placement chess
• Crazyhouse
• Atomic
• S-chess
• Capablanca
• Gothic
• Grand
• Shako
• Shogun
• Orda
• Synochess
• Hoppel-Poppel
• Shinobi
• Empire Chess
• Orda Mirror
• Chak
• Chennis
• S-house (S-chess+Crazyhouse)
• Capahouse (Capablanca+Crazyhouse)
• Grandhouse (Grand chess+Crazyhouse)
• Chess

Additionally you can check Chess960 option in for Chess, Crazyhouse, Atomic, S-chess, Capablanca and Capahouse to start games from random positions with Chess960 castling rules

For move generation, validation, analysis and engine play it uses

• Fairy-Stockfish
• fairy-stockfish.wasm
• fairyfishnet fork of fishnet
• lichess-bot-variants fork of lichess-bot

On client side it is based on chessgroundx fork of chessground

As you know, pychess-variants is a free server and it will remain free forever. However, maintaining and improving the server costs time and money.

If you like our work and find our server useful, please donate through patreon or directly through paypal!! Your contribution will be greatly appreciated and help me continue to develop this awesome server.

• You need mongodb up and running. Mongo daemon

pip3 install -r requirements.txt --user // Install python requirements
yarn install                            // Install node requirements
yarn dev                                // Compile typescript files to javascript
yarn md                                 // Compile md files to html

python3 server/server.py

Pychess-variants should support almost all browsers. Though older browsers (including any version of Internet Explorer) will not work. For your own sake, please upgrade. Security and performance, think about it!

Only Fairy-Stockfish analysis might not work on all browsers.