Licences

ChessReflex runs the Stockfish 18 chess engine in your browser, using the Stockfish.js build (stockfish-18-lite-single) by Chess.com, LLC and Nathan Rugg, based on Stockfish by T. Romstad, M. Costalba, J. Kiiski, G. Linscott and other contributors. Stockfish is free software under the GNU General Public License version 3. ChessReflex ships the engine unmodified.

• Licence text (GPLv3)
• Stockfish.js source
• Stockfish source

The piece set is by Colin M.L. Burnett, used under the BSD licence (also available under the GPL and GFDL), as distributed with react-chessboard.

Opening names, opening statistics and the stored tactics puzzles come from the Lichess open database and the lichess-org/chess-openings project, released under CC0 (public domain). Thank you, Lichess.

• chess.js: BSD 2-Clause licence
• react-chessboard: MIT licence
• ts-fsrs: MIT licence
• lucide-react icons: ISC licence
• Next.js and React: MIT licence
• Geist and Bricolage Grotesque fonts: SIL Open Font Licence 1.1