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ChessPlayX

Stockfish.js 19

AI chess uses the unmodified lite single-thread build of Stockfish.js, distributed under GPLv3. The engine runs in a separate Web Worker and loads when you choose AI play.

Read the GPLv3 license · Source code and build instructions

Fairy-Stockfish

Chess variants and Connect Four use Fairy-Stockfish under GPL-3.0-or-later. The complete corresponding source, changes and build instructions are provided below.

Nokamute · Hive

Hive uses Nokamute under the MIT license. Its dependency licenses and copyright notices are included in the notice file.