Chess engine used by Chess Trainer
==================================

The files in this folder are the Stockfish chess engine, compiled for the
browser as Stockfish.js. They are used here unmodified, exactly as published.

  Engine:   Stockfish 19
  Build:    Stockfish.js 19.0.0 ("lite" builds)
  Files:    stockfish-19-lite.js / stockfish-19-lite.wasm
                (multi-threaded)
            stockfish-19-lite-single.js / stockfish-19-lite-single.wasm
                (single-threaded, used when the browser cannot run threads)

Licence
-------
Stockfish and Stockfish.js are free software, licensed under the GNU General
Public License version 3 (GPLv3). The full licence text is in Copying.txt in
this folder.

  Stockfish.js (c) 2026, Chess.com, LLC
  Based on Stockfish (c) T. Romstad, M. Costalba, J. Kiiski, G. Linscott and
  other contributors.

Source code
-----------
The complete source code for these builds is available from:

  Stockfish.js 19.0.0 (this build):
      https://github.com/nmrugg/stockfish.js/tree/v19.0.0
      https://github.com/nmrugg/stockfish.js/releases/tag/v19.0.0

  Stockfish (the engine it is built from):
      https://github.com/official-stockfish/Stockfish

The engine runs as a separate program in its own web worker. Chess Trainer
talks to it only by sending and receiving text commands (the UCI protocol);
Chess Trainer's own code is not part of the engine and is not covered by the
engine's licence.