OPEN SOURCE

Licenses & source code

Project origin & development

Kinglet Chess was built on LLM Chess Arena by DeadPackets. The original project is published under the MIT license; its copyright and license notices are preserved for the inherited parts.

Kinglet is developed independently. The original arena for chess games with language models has evolved into a substantially redesigned application for learning and playing chess, with its own interface, lessons and puzzles, a tutor, local Stockfish computation in the browser, personal accounts and games between people.

Stockfish.js 17.1.0

Opponent, tutor evaluation and analysis run on your device. We use the full single-thread edition with both NNUE networks, with no lite fallback. Slower devices can take longer.

Stockfish.js © 2025 Chess.com, LLC. Stockfish © T. Romstad, M. Costalba, J. Kiiski, G. Linscott and contributors. GPLv3, without warranty. Source commit: 602fd7e1a571a2be71f242942db90483731f2a1f.

Traffic lights & libraries

The traffic lights use unchanged local chess rules with python-chess 1.11.2 (GPLv3+), Pyodide 0.27.7 (MPL 2.0), CPython 3.12.7 and Emscripten. Original MIT application notices and other library notices are retained.

Browser application license

The distributed Kinglet browser application, including its adapters and the Stockfish/python-chess combination, is offered under GNU GPL version 3, without warranty. You may use, study, modify and redistribute it under that license. Original MIT notices and individual third-party licenses are retained. Complete corresponding sources and license texts are available below.

Corresponding source and build instructions

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