# Third-party credits

- Chessground 10.5.0, Lichess contributors, GPL-3.0-or-later: https://github.com/lichess-org/chessground. License text: vendor/chessground-LICENSE. Package sources retained through package-lock.json and npm package.
- Cburnett chess pieces: Colin M. L. Burnett, GPL-2.0-or-later. Merida chess pieces: Armando Hernandez Marroquin, GPL-2.0-or-later. SVGs copied unmodified from lichess-org/lila commit e19c044af145c833d3a9133fa8f9418b1159767d. Exact URLs and SHA-256: pieces/manifest.json. Original attribution: vendor/lila-COPYING.md.
- Lichess opening names and puzzle database: CC0. https://github.com/lichess-org/chess-openings and https://database.lichess.org/.
- User-created trap studies retain their original authorship; local learning only, not assumed CC0. See repository SOURCES.md.
- Stockfish 19: GPL-3.0. Official binary archive includes source and license in engines/stockfish/. https://github.com/official-stockfish/Stockfish.
- python-chess rules/PGN/UCI: GPL-3.0-or-later. https://github.com/niklasf/python-chess.
- Move sounds are synthesized locally; no Chess.com or Lichess sound samples are bundled.

The application is independent and is not affiliated with Lichess or Chess.com.