Chesslizar — third-party software notices
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This site sends the following third-party software to your browser. Each is
listed with its licence and where its source code can be obtained.


1. Stockfish.js 18 (stockfish npm package 18.0.8), "lite single-threaded" build
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Files served:
  /js/vendor/stockfish-18-lite-single.js
  /js/vendor/stockfish-18-lite-single.wasm
Used for: the optional move-quality analysis on the game replay page.

Copyright (c) 2026 Chess.com, LLC (Stockfish.js port)
Based on Stockfish, Copyright (c) T. Romstad, M. Costalba, J. Kiiski,
G. Linscott and other Stockfish contributors.
Neural network by Linmiao Xu (linrock).

Licence: GNU General Public License, version 3 (GPL-3.0).
Full licence text: /js/vendor/stockfish-COPYING.txt
  (also https://www.gnu.org/licenses/gpl-3.0.html)

Corresponding source code for exactly the files served:
  Stockfish.js release v18.0.8:
    https://github.com/nmrugg/stockfish.js/tree/v18.0.8
    https://www.npmjs.com/package/stockfish/v/18.0.8
  Upstream Stockfish engine:
    https://github.com/official-stockfish/Stockfish
  Network file (nn-9067e33176e):
    https://tests.stockfishchess.org/nns?network_name=nn-9067e33176e

The files are served unmodified. You may copy, modify and redistribute them
under the terms of the GPL-3.0. The engine runs only inside your browser; the
rest of this site is a separate program that talks to it over its standard
UCI text interface.


2. Socket.IO client 4.8.3
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File served: /js/vendor/socket.io.min.js
Used for: the live connection to the game server.
Source: https://github.com/socketio/socket.io/tree/socket.io-client@4.8.3

Licence: MIT

  Copyright (c) 2014-2025 Guillermo Rauch

  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.


3. Loaded from third-party CDNs (not hosted here)
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These are fetched by your browser directly from their own servers, each
under its own licence:
  - Inter, Black Ops One, Noto Sans Symbols 2 — Google Fonts,
    SIL Open Font License 1.1
  - LXGW WenKai TC (lxgw-wenkai-tc-webfont 1.2.0, via jsDelivr) —
    SIL Open Font License 1.1
  - flag-icons 7.3.0 (via jsDelivr) — MIT