585
edits
Changes
→Fat Fritz 2
and was soon separated after the intervention of the Stockfish community due to a possible [[Free Software Foundation#GPL|GPL license]] violation <ref>[https://blog.stockfishchess.org/post/643239805544792064/statement-on-fat-fritz-2 Statement on Fat Fritz 2] by [[Joost VandeVondele]], [[Computer Chess Forums|Stockfish Blog]], February 15, 2021</ref>.
While the separated none GPL licensed NNUE file had a replacement on GitHub <ref>[https://github.com/DanielUranga/Stockfish/blob/ff2/src/FatFritz2_v1.bin Stockfish/FatFritz2_v1.bin at ff2 · DanielUranga/Stockfish · GitHub]</ref>, it was not identical with the commercial purchased network, yielding in weaker play <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76537&start=238 Re: Fat Fritz 2] by [[Stefan Pohl]], [[CCC]], February 13, 2021</ref>.
The Stockfish community, denying Fat Fritz 2's originality as claimed by ChessBase, initially reacted with the release of [[Stockfish|Stockfish 13]] on February 19, 2021 <ref>[https://blog.stockfishchess.org/post/643570707142492160/stockfish-13 Stockfish 13], The Stockfish Team, February 19, 2021</ref>. In summer 2021, the Stockfish team filed a [https://en.wikipedia.org/wiki/Lawsuit lawsuit] against [[ChessBase]] to enforce the consequences of the license termination concerning Fat Fritz 2 and the allegedly Stockfish derivative [[Houdini#Stockfish|Houdini 6]] sold by ChessBase <ref>[https://stockfishchess.org/blog/2021/our-lawsuit-against-chessbase/ Our lawsuit against ChessBase], [[Stockfish|The Stockfish team]], [[Computer Chess Forums|Stockfish Blog]], July 20, 2021</ref>. From November 2022, ChessBase has stopped selling both Fat Fritz 2 and [[Houdini#Stockfish|Houdini]] as an agreement with the Stockfish team to end their legal dispute<ref>[https://stockfishchess.org/blog/2022/chessbase-stockfish-agreement/ ChessBase GmbH and the Stockfish team reach an agreement and end their legal dispute] by [[Stockfish|The Stockfish team]], [[Stockfish Blog]], November 18, 2022</ref>.
=See also=
* [[AlphaZero]]
* [[Deus X]]
* [[Fat Titz]]
* [[Fritz]]
* [[Leela Chess Zero]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77762 Stockfish: Our lawsuit against ChessBase] by Kurt Lanc, [[CCC]], July 20, 2021
* [https://prodeo.actieforum.com/t465-stockfish-sues-chessbase Stockfish sues Chessbase!] by mwyoung, [[Computer Chess Forums|ProDeo Forum]], July 20, 2021
==2022==
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=81029 SF vs ChessBase declared a draw] by [[Dietrich Kappe]], [[CCC]], November 19, 2022
=Blog Posts=
* [https://lichess.org/blog/YPc7GREAACgAevs5/fat-fritz-is-not-the-only-ripoff-and-now-chessbase-is-getting-sued Fat Fritz is not the Only Ripoff and now ChessBase is Getting Sued], [[Lichess]], July 20, 2021
* [https://www.chess.com/news/view/stockfish-developers-sue-chessbase-claiming-copyright-violation Stockfish Developers Sue Chessbase Claiming Copyright Violation] by [[Peter Doggers]], [[Chess.com]], July 23, 2021
* [https://stockfishchess.org/blog/2022/chessbase-stockfish-agreement/ ChessBase GmbH and the Stockfish team reach an agreement and end their legal dispute] by [[Stockfish|The Stockfish team]], [[Stockfish Blog]], November 18, 2022
=External Links=
