KOA

Engine credits

Stockfish.js 19, unmodified, GPL v3.

19.0Stockfish.js
GPL v3Licence
3Levels
The engine

Stockfish.js © 2026 Chess.com, LLC, based on Stockfish and its contributors. Lite, single-threaded WebAssembly.

KOA levels

Practice: skill 3, depth 8, 0.6 s. Club: skill 12, depth 16, 1.2 s. Grandmaster: skill 20, depth 24, 3 s. Engine settings, not Elo ratings.

Source
Corresponding source GitHub Source archive .tar.gz Engine release v19.0.0 Upstream Stockfish GitHub
Full licence text (GNU GPL v3)
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