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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>.
=See also=
* [[AlphaZero]]
* [[Deus X]]
* [[Fat Titz]]
* [[Fritz]]
* [[Leela Chess Zero]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71540 'Deus X' Unveiled as FAT FRITZ PROJECT...] by supersharp77, [[CCC]], August 13, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71658 Match between SF 10 and Fat Fritz] by Steppenwolf, [[CCC]], August 26, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71661 Chessbase's Albert Silver on LC0 & Fat Fritz] by supersharp77, [[CCC]], August 26, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71906 "Fat fritz" stronger than Stockfish ?] by Mehdi Amini, [[CCC]], September 24, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=72140 UCI Win/Draw/Loss reporting] by [[Gian-Carlo Pascutto]], [[CCC]], October 22, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76572 FF2 verses SF, what are the important differences?] by [[Dann Corbit]], [[CCC]], February 13, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76632 Interesting read about Fat Fritz 2] by Marc-O Moisan-Plante, [[CCC]], February 19, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76664 Are neural nets (the weights file) copyrightable?] by [[Adam Treat]], [[CCC]], February 21, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76673 Fat Fritz 2 nets: Github posted vs commercial] by Tibono, [[CCC]], February 22, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76686 Why I stood up for Allie is why I stand up for FF2] by [[Dietrich Kappe]], [[CCC]], February 23, 2021 » [[Allie]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76718 The distinction between engines and neural nets] by Madeleine Birchfield, [[CCC]], February 26, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76730 An actual interesting computer chess read about FF2] by [[Dietrich Kappe]], [[CCC]], February 27, 2021 » [[#StephenHam|Stephen Ham article]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76742 How to make a double-sized net as good as SF NNUE in a few easy steps] by [[Chris Whittington]], [[CCC]], February 28, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76826 It walks like a clone, it quacks like a clone ...] by [[Michael Byrne|MikeB]], [[CCC]], March 09, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77612 Time to rethink what Albert Silver has done?] by [[Srdja Matovic]], [[CCC]], July 03, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77752 Fat Fritz question] by Leo Anger, [[CCC]], July 18, 2021
* [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
=Blog Posts=
* [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
* [https://lichess.org/blog/YCvy7xMAACIA8007/fat-fritz-2-is-a-rip-off Fat Fritz 2 is a rip-off], The [[Stockfish]], [[Leela Chess Zero]] and [[Lichess]] teams, February 16, 2021
* [https://chess24.com/en/read/news/chessbase-s-fat-fritz-2-condemned-as-rip-off-stockfish-clone ChessBase’s Fat Fritz 2 condemned as ‘rip-off’ Stockfish clone] by [[Colin McGourty]], [[Chess24]], February 22, 2021
* [https://www.chess.com/news/view/chessbase-fat-fritz-2-stockfish-leela-chess-zero Open Source Community Critical Of Chessbase, Fat Fritz 2] by [[Peter Doggers]], [[Chess.com]], February 24, 2021 » [[Matthew L. Ginsberg]]
* [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 » [[Houdini#Stockfish|Houdini 6]]
* [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
=External Links=
==Purchase==
* [https://shop.chessbase.com/en/products/fritz_17 Fritz 17 - The giant PC chess program, now with Fat Fritz] - [[ChessBase|ChessBase Shop]]
* [https://shop.chessbase.com/en/products/fat_fritz_2 Fat Fritz 2SE] - [[ChessBase|ChessBase Shop]]* [https://shop.chessbase.com/en/products/fat_fritz_2_powerbook_2021 Fat Fritz 2 SE + Fritz Powerbook 2021] - [[ChessBase|ChessBase Shop]]* [https://store.steampowered.com/app/1587750/Fat_Fritz_20_SE/ Fat Fritz 2.0 SE] on [https://en.wikipedia.org/wiki/Steam_(service) Steam]* [https://www.newinchess.com/fat-fritz-2-0 Fat Fritz 2.0 SE], [https://en.wikipedia.org/wiki/New_In_Chess New In Chess]* [https://www.houseofstaunton.com/fat-fritz-2-0.html Fat Fritz 2.0 SE], [https://en.wikipedia.org/wiki/House_of_Staunton House Of Staunton]* [https://www.uscfsales.com/fat-fritz-2-0.html Fat Fritz 2.0 SE], [https://www.uscfsales.com/ The Official Chess Shop of the US Chess Federation - Chess Pieces, Chess Sets, Chess Boards, Chess Clocks and More!]* [https://www.amazon.com/Playing-Software-Bundled-Success-Training/dp/B08W1WYXG3/ref=sr_1_1?dchild=1&keywords=Fat+Fritz+2&qid=1626991799&sr=8-1 Amazon.com: Fat Fritz 2.0 Chess Playing Software Bundled with Chess Success II Chess Training DVD: Toys & Games]
==ChessBase News==
===2019===
: {{#evu:https://www.youtube.com/watch?v=9C-E1BqzLcs|alignment=left|valignment=top}}
* [https://en.chessbase.com/post/how-a-neural-network-is-made How a neural network is made] by [[Albert Silver]], [[ChessBase|ChessBase News]], February 21, 2021
* <span id="StephenHam"></span>[https://en.chessbase.com/post/discussing-moves-with-a-neural-network Discussing moves with a neural network] by [[Stephen Ham]], [[ChessBase|ChessBase News]], February 27, 2021 <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76730 An actual interesting computer chess read about FF2] by [[Dietrich Kappe]], [[CCC]], February 27, 2021</ref>* [https://en.chessbase.com/post/steamrolling-the-king Steamrolling the king], [[ChessBase|ChessBase News]], June 15, 2021* [https://en.chessbase.com/post/solving-the-impossible Solving the impossible] by [[Albert Silver]], [[ChessBase|ChessBase News]], June 24, 2021
==Fritz 17==
* [https://en.chessbase.com/post/fritz-17-with-fat-fritz-and-goodies Introducing Fritz 17 with Fat Fritz and other goodies], [[ChessBase|ChessBase News]], November 12, 2019
