Licences
Last updated 4 November 2026
Shohmot is built on free and open-source work. Thank you to everyone behind it.
| What | Used for | Licence |
|---|---|---|
| Stockfish 19, built for the web by stockfish.js | All engine analysis, in your browser | GNU GPL v3 |
| chess.js | Chess rules, PGN and FEN | BSD 2-Clause |
| Lichess chess-openings | Opening names and book moves | CC0 (public domain) |
| Chess pieces by Colin M.L. Burnett, as distributed by Lichess | The board | GNU GPL v2 or later |
| Lichess (lila)’s published accuracy and win-chance formulas | Accuracy, reimplemented | The formulas, from lila’s AGPL v3 source |
| Geologica, Onest and JetBrains Mono | The typefaces | SIL Open Font License 1.1 |
| Astro | Building the site | MIT |
Stockfish’s source code
The Stockfish builds Shohmot sends to your browser are unmodified releases of the stockfish npm package, version 19.0.1. Their complete source is at github.com/nmrugg/stockfish.js and github.com/official-stockfish/Stockfish. Under the GPL you’re free to use, study, change and share them. If you’d like a copy of the exact source from us, write to support@shohmot.app.
Shohmot’s own code
Shohmot’s source is on GitHub.