Licenses & Credits

Chess Premium is built with the help of the amazing open-source chess community. We gratefully acknowledge the creators and projects below.

Chess Piece Artwork

This app uses the chess piece artwork created by Maurizio Monge.

These artworks are licensed under the MIT License. Usage is permitted in free or commercial applications provided appropriate credit is given to the original author.

Author: Maurizio Monge (maurizio.monge AT gmail.com)

Stockfish Engine

This app uses the Stockfish 18 chess engine for AI analysis and gameplay features.

Stockfish is free open-source software licensed under the GNU General Public License v3.0 (GPL).

Community & Inspiration

Special appreciation to the contributors in the open chess ecosystem whose work and dedication inspire this project:

• Thibault Duplessis: Founder of Lichess.org.
• James Clarke: Contributor to Lichess.org puzzle generation and cheat detection.

Names listed for acknowledgment purposes only.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files, to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies.

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.