Lukas300 Chess — engine credits

The opponent is powered by Stockfish 19 Lite, not a proprietary chess engine.
Stockfish.js 19.0.0: Copyright 2026 Chess.com, LLC and the Stockfish contributors.
License: GNU General Public License, version 3. See STOCKFISH-LICENSE.txt.
Unmodified stockfish-19-lite-single.js and stockfish-19-lite-single.wasm.
Lite network: nn-61e7af4bb97d, by Chris Bao (sscg13).

Corresponding upstream source (exact npm git commit):
https://github.com/nmrugg/stockfish.js/tree/54fde71d90c7c403964f6cacef48f7bbec495df1
Download source:
https://github.com/nmrugg/stockfish.js/archive/54fde71d90c7c403964f6cacef48f7bbec495df1.zip
Build instructions are in the upstream README.md and build.js.
Package: https://www.npmjs.com/package/stockfish/v/19.0.0
Stockfish authors: https://github.com/official-stockfish/Stockfish/blob/master/AUTHORS

The Lite engine is smaller and weaker than the full Stockfish engine.
Difficulty names are settings, not measured Elo ratings. The adapter does not
intentionally weaken Strong or Maximum. No claim of beating full Stockfish.