Free software notices

Open-source licenses.

Oh My Chess uses the Stockfish chess engine. Stockfish is free software licensed under the GNU General Public License version 3.

Your rights under GPLv3

You may run, study, share and modify Stockfish under the terms of GPLv3. The source downloads below preserve the exact upstream revisions and build inputs corresponding to the Stockfish engine files distributed by this website.

Read the full GNU GPL version 3 license.

Stockfish 10

The Stockfish 10 archive contains upstream revision 8e50b722353b5fc111b240ea060e872b8b97f42e, its C++ source and build script, and the exact generated engine files used by Oh My Chess.

Download the Stockfish 10.0.2 corresponding source archive.

Stockfish 18 Lite Single

The Stockfish 18 archive contains upstream revision 93c994592dcf3b4b21052ab925e9b534df9c0918, its source and build scripts, and the required verified NNUE network.

Download the Stockfish 18.0.8 Lite Single corresponding source archive.

Verify the downloads

Use the published SHA-256 checksums to verify both archives. Each archive also contains detailed source, build and production-file mapping notes.

The software is provided without warranty, as described in GPLv3.