Credits and licenses
This site is made by the team behind ChessHelper (chesshelper.ai). It relies on the open-source software and openly licensed images below, and we thank their authors.
Chess engine
Stockfish 10, compiled to WebAssembly and asm.js for the browser, by the Stockfish developers. License: GNU General Public License v3. Source code: github.com/official-stockfish/Stockfish. The license text is published at /vendor/stockfish-COPYING-GPLv3.txt, and the engine files are served unmodified from /vendor/.
Move generation
chess.js 0.10.3 by Jeff Hlywa, used for legal moves, notation and FEN checks. License: BSD 2-Clause. Source: github.com/jhlywa/chess.js. License text: /vendor/chess.js-LICENSE.txt.
Chess pieces
The Spatial piece set by Maurizio Monge, used for the finder and all diagrams. License: MIT.
Photos
- Young player at a tournament board ("LittleChess.jpg"). Photo: UzbekistanWikiEditor, Wikimedia Commons, CC BY 4.0
- Club evening ("Canada Water Chess Club 4"). Photo: Barney Moss from London, UK, Wikimedia Commons, CC BY 2.0
- Hands playing chess on a wooden board at home. Photo: Shixart1985, Wikimedia Commons, CC BY 2.0
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Photos are shown resized and converted to WebP; they are otherwise unchanged.
Fonts and icons
The site uses your device's system fonts. The favicon is made from the Spatial white bishop.