Open source notices
Stockfish.js 17.1
FreshChess distributes the Stockfish.js 17.1 lite single-threaded WebAssembly engine, copyright Chess.com, LLC and Stockfish contributors, under the GNU General Public License version 3.
GPLv3 license · Authors · Complete corresponding source archive · Upstream source tag
The engine is provided without warranty. The linked v17.1.0 source archive contains the preferred source and build scripts for the exact upstream release used here. A verified preservation copy is retained with the FreshChess release materials (SHA-256 3f9b2e97fb73a1481b0794194e634aa6fb414048f41cb769674350dc2c7fd6e0).
chess.js
Copyright © 2025 Jeff Hlywa. Distributed under its BSD-style license, retained in assets/chess.esm.js. Upstream project.
chessboard-element
Copyright its contributors. Distributed under the MIT License. Upstream project. The bundled board includes the Cburnett chess piece artwork and Lit runtime used by that project.