Game library notices
Chess uses these open-source libraries.
Stockfish.js 18.0.8 Lite, single-threaded
Unmodified Stockfish engine build, distributed under GPL version 3. Copyright and contributors are retained in the supplied files.
GPL license · Exact corresponding source and build instructions · Download corresponding source · Upstream build README
Card artwork and audio
Adrian Kennard playing cards (CC0) · Kenney casino audio (CC0)
chess.js 1.4.0
Chess rules and move validation, BSD 2-Clause license. Full license and copyright notice.
Playing-card artwork by Adrian Kennard (CC0), with traditional court figures. Card sounds by Kenney (CC0). Standard board and card rules are described in each game.