About & credits

RewindChess is a free game reviewer for chess.com and Lichess players. It is not affiliated with chess.com or Lichess.

Stockfish

Reviews are computed by Stockfish, the free and open-source chess engine (© the Stockfish developers, GNU GPL v3).

In the browser we run the unmodified stockfish.js 19 WebAssembly build (© Chess.com, LLC and contributors, GPL v3) as a separate program in a Web Worker, talking to it only through the UCI protocol. The desktop app ships unmodified native Stockfish binaries the same way.

Licence text: GNU GPL v3
Engine source: SOURCE.txt (exact build we serve)

Artwork and data

Chessnut pieces by Alexis Luengas (Apache-2.0).
Fantasy pieces by Maurizio Monge (MIT).
Opening names from the Lichess chess-openings dataset (CC0).
Move-label icons, colours and board themes are original RewindChess designs.
Board: react-chessboard (MIT). Rules and PGN: chess.js (BSD-2).
Fonts: Fraunces, Schibsted Grotesk and Martian Mono (SIL Open Font License).