Credits and attributions
ChessIQ stands on a deep stack of open-source software and public chess data. The projects below make this product possible.
Stockfish
The world's strongest open-source chess engine. ChessIQ uses Stockfish for every position evaluation, every move classification, and every blunder it surfaces. Stockfish is licensed under the GNU General Public License v3. Source code: github.com/official-stockfish/Stockfish. Project home: stockfishchess.org.
Lichess
ChessIQ reads from the public Lichess API for player games, the opening explorer, the masters database, and the Syzygy tablebase. Lichess is a free, open-source chess server run by a non-profit; their source code is published under the GNU Affero General Public License v3. The Lichess puzzle database we use is released into the public domain (CC0). If Lichess is useful to you, consider supporting them.
Chess.com
ChessIQ reads from the public Chess.com Published Data API to import the games you authorize us to import on your behalf. Chess.com is a registered trademark of Chess.com, LLC. ChessIQ is independent and not affiliated with, endorsed by, or sponsored by Chess.com.
chess.js
Move generation, validation, and PGN parsing in the browser. github.com/jhlywa/chess.js. BSD-2-Clause.
react-chessboard
The interactive chessboard component. github.com/Clariity/react-chessboard. MIT.
Piece sets
The Lichess-sourced piece sets shown in Settings (Cburnett, Merida, Alpha, and others) are distributed by Lichess under various open-source licenses; see the Lichess COPYING file for the per-set details and original artists.
Trademarks
"Chess.com" is a trademark of Chess.com, LLC. "Lichess" is a trademark of Lichess. "Stockfish" is a trademark of the Stockfish project. All trademarks are property of their respective owners and are used here for identification purposes only.