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=Fat Fritz 2=
'''Fat Fritz 2''' , released on February 09, 2021, is based on [[NNUE]] technology of and [[Stockfish|Stockfish 12]] with a double sized network,
and thus, running on a CPU, not requiring expensive [[GPU]] graphic cards for game playing like its predecessor.
The network was trained by [[Albert Silver]] with the help of [[Daniel Uranga]] and [[Dietrich Kappe]], who provided scripts and ideas.
Further credits were given to the [[:Category:Stockfish Contributor|Stockfish contributors]], and in particular [[Yu Nasu]] for his groundbreaking work on NNUE, and [[Hisayori Noda]] for the initial [[Stockfish NNUE]] implementation <ref>[https://en.chessbase.com/post/fat-fritz-2-best-of-both-worlds Fat Fritz 2: The Best of Both Worlds] by [[Albert Silver]], [[ChessBase|ChessBase News]], February 10, 2021</ref>.
Using the original Fat Fritz as initial supervisor to evaluate chess positions, the learning of Fat Fritz 2 was [[Reinforcement Learning|reinforced]] by Stockfish's [[Alpha-Beta|alpha-beta]] [[Search|search]] <ref>[https://en.chessbase.com/post/fat-fritz-2-0-the-new-number-1 Fat Fritz 2.0 - The new number 1], [[ChessBase|ChessBase News]], February 09, 2021</ref>. While the The initial release had the 40 MiB NNUE file embedded inside the Fat Fritz 2 executable, it and was soon separated after the intervention of the Stockfish community due to a possible [[Free Software Foundation#GPL|GPL license]] violation, the Stockfish executable with source code available at [https://en.wikipedia.org/wiki/GitHub GitHub] <ref>[https://githubblog.stockfishchess.comorg/DanielUrangapost/Stockfish643239805544792064/tree/ff2 GitHub statement-on-fat-fritz- DanielUranga/Stockfish at ff22 Statement on Fat Fritz 2] by [[Daniel UrangaJoost VandeVondele]], [[Computer Chess Forums|Stockfish Blog]], February 15, 2021</ref>, and a . While the separated none GPL licensed NNUE file had a replacement on GitHub as well <ref>[https://github.com/DanielUranga/Stockfish/blob/ff2/src/FatFritz2_v1.bin Stockfish/FatFritz2_v1.bin at ff2 · DanielUranga/Stockfish · GitHub]</ref>, obviously it was not identical with weights resulting in weaker play than 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, 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>.
=See also=
* [[YaneuraOu]]
=Blog & Forum Posts=
==2019==
* [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=76537 Fat Fritz 2] by [[Jouni Uski]], [[CCC]], February 09, 2021
: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76537&start=270 Re: Fat Fritz 2] by [[Gary Linscott|gladius]], [[CCC]], February 14, 2021 » [[CCRL]]
* [https://twitter.com/gcpascutto/status/1359193623171055617?s=20 If your idea of innovation ...] by [[Gian-Carlo Pascutto]], [https://en.wikipedia.org/wiki/Twitter Twitter], February 09, 2021
* [https://groups.google.com/g/fishcooking/c/VoCCwyRrYT8/m/3N_ShromAgAJ Fat Fratz 2.0 Copyleft Infringement] by Bernt Nicht, [[Computer Chess Forums|FishCooking]], February 10, 2021
: [https://groups.google.com/g/fishcooking/c/VoCCwyRrYT8/m/V8GrIbdCAgAJ Re: Fat Fratz 2.0 Copyleft Infringement] by [[Joost VandeVondele]], [[Computer Chess Forums|FishCooking]], February 10, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76567 Calling All Armchair GPL Lawyers] by [[Andrew Grant]], [[CCC]], February 12, 2021
* [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
=Blog Posts=
<ref>[https://www.fatfritz.net/ fatfritz.net]</ref>
* [https://schach.computer/fat-fritz-2-ein-unmoralisches-angebot/ Fat Fritz 2 - Ein unmoralisches Angebot] by [https://schach.computer/author/schachfreunde/ Topschach Benny], February 12, 2021 (German)
* [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]]
=External Links=
* <span id="interview"></span>[https://en.chessbase.com/post/interview-with-albert-silver-his-journey-to-fat-fritz-2-0 Interview with Albert Silver - His journey to Fat Fritz 2.0] by [https://www.udemy.com/user/arne-kaehler/ Arne Kaehler], [[ChessBase|ChessBase News]], February 12, 2021, [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: {{#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>
==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
[[Category:Commercial]]
[[Category:ChessBase]]
[[Category:Derivative]]
[[Category:UCI]]
[[Category:X64]]
