Open-source licenses

This site is built with the following open-source software and data. Thank you to their authors.

• Stockfish 19 (Stockfish.js, lite WebAssembly build)

  Chess engine that analyses games in your browser.

  License: GNU General Public License v3.0 · Source code: github.com/nmrugg/stockfish.js

• chess.js

  Chess rules and PGN parsing.

  License: BSD 2-Clause · Source code: github.com/jhlywa/chess.js

• react-chessboard

  The chessboard and its piece images.

  License: MIT · Source code: github.com/Clariity/react-chessboard

• Lichess chess-openings dataset

  Names and moves of the openings.

  License: CC0 1.0 (public domain) · Source code: github.com/lichess-org/chess-openings