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The development of the Fairy-Stockfish engine started in 2018 by Fabian Fichter based on Stockfish after previous experiments with more specialized Stockfish chess variant forks that lead to the idea of creating a more generic engine with easy extensibility but still using the powerful Stockfish engine as a basis. Over time it became the strongest chess variant engine in a large variety of games, especially after the advent of NNUE, and is now powering analysis and play against the computer on several chess (variant) websites, such as lichess.org and pychess.org.
This website is deployed using Github Pages and the Bulma clean theme, also see the website's code repository.
Fairy-Stockfish is free and open source, and it is distributed under the GNU General Public License version 3 (GPLv3). This means that you can modify and redistribute the program and source code. However, whenever you distribute Fairy-Stockfish, you must make your source code available. Any changes to the source code must also be licensed under the GPL.
See the license for more details.