Difference between revisions of "Fat Fritz"

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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>.  
 
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>.  
 
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, 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>.
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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=
 
=See also=
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* [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=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=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
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* [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=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=7&t=72140 UCI Win/Draw/Loss reporting] by [[Gian-Carlo Pascutto]], [[CCC]], October 22, 2019
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* [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=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=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
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* [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
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* [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
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* [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
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* [https://prodeo.actieforum.com/t465-stockfish-sues-chessbase Stockfish sues Chessbase!] by mwyoung, [[Computer Chess Forums|ProDeo Forum]], July 20, 2021
  
 
=Blog Posts=
 
=Blog Posts=
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* [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://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://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]]
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* [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]]
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* [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
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* [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=
 
=External Links=
 
==Purchase==
 
==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/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 2] - [[ChessBase|ChessBase Shop]]
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* [https://shop.chessbase.com/en/products/fat_fritz_2 Fat Fritz 2 SE] - [[ChessBase|ChessBase Shop]]
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* [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]
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* [https://www.newinchess.com/fat-fritz-2-0 Fat Fritz 2.0 SE], [https://en.wikipedia.org/wiki/New_In_Chess New In Chess]
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* [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]
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* [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!]
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* [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==
 
==ChessBase News==
 
===2019===
 
===2019===
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* [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
 
* [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>
 
* <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>
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* [https://en.chessbase.com/post/steamrolling-the-king Steamrolling the king], [[ChessBase|ChessBase News]], June 15, 2021
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* [https://en.chessbase.com/post/solving-the-impossible Solving the impossible] by [[Albert Silver]], [[ChessBase|ChessBase News]], June 24, 2021
 
==Fritz 17==
 
==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
 
* [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

Revision as of 21:53, 24 July 2021

Home * Engines * Fat Fritz

Unser Fritz [1]

Fat Fritz,
a commercial chess entity by ChessBase, the first version released in November 2019 featuring a set of custom made neural network weights that work in the open source project Leela Chess Zero within its Lc0 executable, while Fat Fritz 2.0 released in February 2021 is based on Stockfish 12 and custom NNUE technology.

Fat Fritz 1

Initially introduced as a cloud project in summer 2019, inspired by DeepMind's ground breaking AlphaZero approach combining Deep learning with Monte-Carlo Tree Search (MCTS) [2], and Albert Silver's Deus X experience, relaxing Leela Chess' "Zero" paradigm of pure reinforcement learning due to supervised learning, Fat Fritz was released in November 2019 as part the Fritz 17 package, best supported by a GPU card such as Nvidia GeForce 20 series. The project and its underlying techniques were emphasized by a talk of AlphaZero co-author Thore Graepel at ChessBase, attended by German computer chess icon Thomas Nitsche along with his sons and Math42 authors Raphael Nitsche and Maxim Nitsche [3]. Fat Fritz was further supported by Daniel Uranga [4] [5].

Lc0diagram.png
Deusx.png

Lc0 and DeusX aka Fat Fritz components [6]

Fat Fritz 2

Fat Fritz 2, released on February 09, 2021, is based on NNUE technology and 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 Stockfish contributors, and in particular Yu Nasu for his groundbreaking work on NNUE, and Hisayori Noda for the initial Stockfish NNUE implementation [7]. Using the original Fat Fritz as initial supervisor to evaluate chess positions, the learning of Fat Fritz 2 was reinforced by Stockfish's alpha-beta search [8]. The initial release had the 40 MiB NNUE file embedded inside the Fat Fritz 2 executable, and was soon separated after the intervention of the Stockfish community due to a possible GPL license violation [9]. While the separated none GPL licensed NNUE file had a replacement on GitHub [10], it was not identical with the commercial purchased network, yielding in weaker play [11]. The Stockfish community, denying Fat Fritz 2's originality as claimed by ChessBase, initially reacted with the release of Stockfish 13 on February 19, 2021 [12]. In summer 2021, the Stockfish team filed a lawsuit against ChessBase to enforce the consequences of the license termination concerning Fat Fritz 2 and the allegedly Stockfish derivative Houdini 6 sold by ChessBase [13].

See also

Forum Posts

2019

2020

Re: Fat Fritz Update by Albert Silver, CCC, December 12, 2020

2021

Re: Fat Fritz 2 by gladius, CCC, February 14, 2021 » CCRL
Re: Fat Fratz 2.0 Copyleft Infringement by Joost VandeVondele, FishCooking, February 10, 2021

Blog Posts

[14]

External Links

Purchase

ChessBase News

2019

2020

2021

Fritz 17

Source Code

ff2 · DanielUranga/Stockfish@e44edde · GitHub
FF2 · DanielUranga/Stockfish@faef72a · GitHub
Stockfish/FatFritz2_v1.bin at ff2 · DanielUranga/Stockfish · GitHub

Rating Lists

References

  1. Malakov tower (build 1873) of Colliery Unser Fritz, Shaft 1, in Herne, North Rhine-Westphalia, part of The Industrial Heritage Trail of the Ruhr area. Photo by GeorgeIvan, May 15, 2014, Wikimedia Commons, Unser Fritz/Crange is further district of Herne (Wanne), famous for its funfair Cranger Kirmes, and SV Unser Fritz the local chess club - eponym of the coal mine was Frederick III, German Emperor
  2. David Silver, Thomas Hubert, Julian Schrittwieser, Ioannis Antonoglou, Matthew Lai, Arthur Guez, Marc Lanctot, Laurent Sifre, Dharshan Kumaran, Thore Graepel, Timothy Lillicrap, Karen Simonyan, Demis Hassabis (2017). Mastering Chess and Shogi by Self-Play with a General Reinforcement Learning Algorithm. arXiv:1712.01815
  3. Fat Fritz – What on Earth is that? by Albert Silver, ChessBase News, August 13, 2019
  4. Standing on the shoulders of giants by Albert Silver, ChessBase News, September 18, 2019
  5. GitHub - DanielUranga/lc0 at uci-wdl-reporting
  6. My failed attempt to change TCEC NN clone rules by Alexander Lyashuk, CCC, September 14, 2019 » TCEC
  7. Fat Fritz 2: The Best of Both Worlds by Albert Silver, ChessBase News, February 10, 2021
  8. Fat Fritz 2.0 - The new number 1, ChessBase News, February 09, 2021
  9. Statement on Fat Fritz 2 by Joost VandeVondele, Stockfish Blog, February 15, 2021
  10. Stockfish/FatFritz2_v1.bin at ff2 · DanielUranga/Stockfish · GitHub
  11. Re: Fat Fritz 2 by Stefan Pohl, CCC, February 13, 2021
  12. Stockfish 13, The Stockfish Team, February 19, 2021
  13. Our lawsuit against ChessBase, The Stockfish team, Stockfish Blog, July 20, 2021
  14. fatfritz.net
  15. An actual interesting computer chess read about FF2 by Dietrich Kappe, CCC, February 27, 2021
  16. Nice review fo Fat Fritz by Jouni Uski, CCC, November 22, 2019
  17. Fat Fritz 1.1 update and a small gift by Albert Silver. ChessBase News, March 05, 2020

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