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'''Fat Fritz''',<br/>
a commercial chess entity by [[ChessBase]] , the first version released in August 2019 featuring a set of custom made [[Neural Networks|neural network]] weights that work in the open source project [[Leela Chess Zero]] within its [[Leela Chess Zero#Lc0|Lc0]] executable,while '''Fat Fritz 2.0''' released in February 2021 is based on [[Stockfish NNUE|Stockfish 12]] and custom [[NNUE]] technology. =Fat Fritz 1=Initially introduced as a cloud project in August summer 2019, inspired by [[DeepMind|DeepMind's]] ground breaking [[AlphaZero]] approach combining [[Deep Learning|Deep learning]] with [[Monte-Carlo Tree Search]] (MCTS) <ref>[[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''. [https://arxiv.org/abs/1712.01815 arXiv:1712.01815]</ref>,
and [[Albert Silver|Albert Silver's]] [[Deus X]] experience, relaxing Leela Chess' "Zero" paradigm of pure [[Reinforcement Learning|reinforcement learning]] due to [[Supervised Learning|supervised learning]], Fat Fritz was released in November 2019 as part the [[Fritz|Fritz 17]] package,
best supported by a [[GPU]] card such as [[Nvidia]] [https://en.wikipedia.org/wiki/GeForce_20_series 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 [https://de.wikipedia.org/wiki/Math42 Math42] authors Raphael Nitsche and Maxim Nitsche <ref>[https://en.chessbase.com/post/fat-fritz-what-on-earth-is-that Fat Fritz – What on Earth is that?] by [[Albert Silver]], [[ChessBase|ChessBase News]], August 13, 2019</ref>. Fat Fritz was further supported by [[Daniel Uranga]] <ref>[https://en.chessbase.com/post/standing-on-the-shoulders-of-giants Standing on the shoulders of giants] by [[Albert Silver]], [[ChessBase|ChessBase News]], September 18, 2019</ref> <ref>[https://github.com/DanielUranga/lc0/tree/uci-wdl-reporting GitHub - DanielUranga/lc0 at uci-wdl-reporting]</ref>.
[[FILE:lc0diagram.png|none|border|text-bottom]]
[[FILE:deusx.png|none|border|text-bottom|670px]]
[[Leela Chess Zero#Lc0|Lc0]] and [[Deus X|DeusX]] aka Fat Fritz components <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71822 My failed attempt to change TCEC NN clone rules] by [[Alexander Lyashuk]], [[CCC]], September 14, 2019 » [[TCEC]]</ref>
=Fat Fritz 2=
'''Fat Fritz 2''' is based on [[NNUE]] technology using [[Stockfish NNUE]] aka [[Stockfish|Stockfish 12]] with a customized, double sized network,
and thus, does not require [[GPU]] graphic cards for game playing <ref>[https://en.chessbase.com/post/92134 Fat Fritz 2: The Best of Both Worlds] by [[Albert Silver]], [[ChessBase|ChessBase News]]</ref>.
The network was trained by [[Albert Silver]] using the original Fat Fritz,
[[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>.
=See also=
* [[AlphaZero]]
* [[Fritz]]
* [[Leela Chess Zero]]
* [[Stockfish NNUE]]
* [[NNUE]]
=Forum Posts=
: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76031&start=7 Re: Fat Fritz Update] by [[Albert Silver]], [[CCC]], December 12, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76105 Fat Fritz for Linux] by [[Joshua Shriver]], [[CCC]], December 20, 2020
==2021==
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76537 Fat Fritz 2] by [[Jouni Uski]], [[CCC]], February 09, 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 2] - [[ChessBase|ChessBase Shop]]==ChessBase News==
===2019===
* [https://en.chessbase.com/post/fat-fritz-what-on-earth-is-that Fat Fritz – What on Earth is that?] by [[Albert Silver]], [[ChessBase|ChessBase News]], August 13, 2019
* [https://en.chessbase.com/post/fat-fritz-ingenious-without-stereotypes Fat Fritz: strong, creative, original] by [[Stephan Oliver Platz]], [[ChessBase|ChessBase News]], March 27, 2020
* [https://en.chessbase.com/post/running-leela-and-fat-fritz-on-your-notebook Running Leela and Fat Fritz on your notebook] by [https://ratings.fide.com/card.phtml?event=2099713 Evelyn Zhu], [[ChessBase|ChessBase News]], June 14, 2020 » [[Leela Chess Zero]]
===2021===
* [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
* [https://en.chessbase.com/post/92134 Fat Fritz 2: The Best of Both Worlds] by [[Albert Silver]], [[ChessBase|ChessBase News]]
==Fritz 17==
* <span id="Review"></span>[https://new.uschess.org/news/fat-fritz-fritz-17-review-i/ Fat Fritz and Fritz 17: A Review (Part I)] by [https://en.chessbase.com/author/john-hartmann John Hartmann], [https://en.wikipedia.org/wiki/United_States_Chess_Federation US Chess], November 17, 2019
* [https://new.uschess.org/news/fat-fritz-fritz-17-review-part-ii/ Fat Fritz and Fritz 17: A Review (Part II)] by [https://en.chessbase.com/author/john-hartmann John Hartmann], [https://en.wikipedia.org/wiki/United_States_Chess_Federation US Chess], November 19, 2019 <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72395 Nice review fo Fat Fritz] by [[Jouni Uski]], [[CCC]], November 22, 2019</ref>
==Source Code==
[[Category:DCNN]]
[[Category:MCTS]]
[[Category:NNUE]]
[[Category:Windows]]
[[Category:Industrial Heritage Trail]]
