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Caissa64

Open-source licenses · Licencias

Third-party software, models and data used by Caissa64. · Software, modelos y datos de terceros que usa Caissa64.

Maia-2 (CSSLab/maia2) — MIT

Used for "What would a player at your level play?" in game review. The model (public/maia/maia2_rapid.onnx, exported by scripts/maia/export_maia2.py from the official "rapid" weights) and the board encoding in src/lib/play-and-learn/coach/maia.ts derive from it. The weights are published by CSSLab through the MIT-licensed package; they carry no separate license.

MIT License

Copyright (c) 2024 CSSLab

Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

ONNX Runtime Web (microsoft/onnxruntime) — MIT

Runs Maia-2 in the browser (public/ort/, copied from node_modules/onnxruntime-web). Copyright (c) Microsoft Corporation.

Stockfish and stockfish.js — GPL-3.0

The engines in public/engine/ (Stockfish 10, bots) and public/stockfish/ (Stockfish 19 lite, analysis) run unmodified in the browser as separate programs. Stockfish (c) T. Romstad, M. Costalba, J. Kiiski, G. Linscott and contributors; stockfish.js (c) Chess.com, LLC. Source: https://github.com/official-stockfish/Stockfish and https://github.com/nmrugg/stockfish.js. The full license text ships in node_modules/stockfish/Copying.txt.

Lichess puzzle database — CC0

The tactics and endgame puzzle banks (src/lib/tactics/** except composition.ts, and src/lib/endgames/exercises.ts) come from https://database.lichess.org/#puzzles, released under CC0 1.0. No attribution is required; most exercises still carry their Lichess puzzle id. Generators: scripts/generate-cc0-banks.py, scripts/generate-common-motifs.py, scripts/generate-mate-patterns.py.

Ideas, not code

The grounded-coach design (verified move facts, "findability", explaining only supplied facts) follows ideas from github.com/bihanikeshav/chesssy. That repository has no license, so none of its code or data is used here.

Champion photos (Wikimedia Commons)

The 400 px thumbnails in public/avatars/ for these players come from Wikimedia Commons, unmodified (the app only crops them visually). Each keeps its original license: