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Leela Chess Zero consists of an executable to play or analyze [[Chess Game|games]], initially dubbed '''LCZero''', soon rewritten by a team around [[Alexander Lyashuk]] for better performance and then called '''Lc0''' <ref>[https://github.com/LeelaChessZero/lc0/wiki/lc0-transition lc0 transition · LeelaChessZero/lc0 Wiki · GitHub]</ref> <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68094&start=91 Re: TCEC season 13, 2 NN engines will be participating, Leela and Deus X] by [[Gian-Carlo Pascutto]], [[CCC]], August 03, 2018</ref>. This executable, the actual chess engine, performs the [[Monte-Carlo Tree Search|MCTS]] and reads the self-taught [[Neural Networks#Convolutional|CNN]], which weights are persistent in a separate file.
Lc0 is written in [[Cpp#14|C++14]] and may be compiled for various platforms and backends. Since deep CNN approaches are best suited to run massively in parallel on [[GPU|GPUs]] to perform all the [[Float|floating point]] [https://en.wikipedia.org/wiki/Dot_product dot products] for thousands of neurons,
the preferred target platforms are [[Nvidia]] [[GPU|GPUs]] supporting [https://en.wikipedia.org/wiki/CUDA CUDA] and cuDNN [https://en.wikipedia.org/wiki/CuDNN CuDNN] libraries <ref>[https://developer.nvidia.com/cudnn NVIDIA cuDNN | NVIDIA Developer]</ref>.[[Ankan Banerjee]] wrote the CuDNN backend code, also shared by [[Deus X]] and [[Allie]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71822&start=48 Re: My failed attempt to change TCEC NN clone rules] by [[Adam Treat]], [[CCC]], September 19, 2019</ref>. None CUDA compliant GPUs ([[AMD]]) are supported through [[OpenCL]], while much slower pure CPU binaries are possible using [https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms BLAS], target systems with or without a [https://en.wikipedia.org/wiki/Video_card graphics card] (GPU) are [[Linux]], [[Mac OS]] and [[Windows]] computers, or BLAS only the [[Raspberry Pi]].
=Description=
The server is written in [[Go (Programming Language)|Go]] along with [[Python]] and [https://en.wikipedia.org/wiki/Shell_script shell scripts].
=Structure DiagramDiagrams=
[[FILE:lc0diagram.png|none|border|text-bottom]]
Related to [[TCEC]] clone discussions concerning [[Deus X]] and [[Allie]] aka [[Allie#AllieStein|AllieStein]],<br/>
[[Alexander Lyashuk]] published diagrams with all components of the affected engines,<br/>
=See also=
* [[Allie]]
* [[AlphaZero]]
* [[Fat Fritz]]
* [[Deus X]]
* [[Leela Zero]]
* [http://www.talkchess.com/forum/viewtopic.php?t=67104 Run LC Zero in LittleBlitzerGUI] by [[Stefan Pohl]], [[CCC]], April 14, 2018 » [[LittleBlitzer]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=67121 LC0 - how to catch up?] by [[Srdja Matovic]], [[CCC]], April 16, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67300 Leela on more then one GPU?] by [[Karlo Balla]], [[CCC]], May 01, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67646 New CLOP settings give Leela huge tactics boost] by [[Albert Silver]], [[CCC]], June 04, 2018 » [[CLOP]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67668 First Win by Leela Chess Zero against Stockfish dev] by [[Ankan Banerjee]], [[CCC]], June 07, 2018 » [[Stockfish]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=70451 32930 Boost network available] by [[Dietrich Kappe]], [[CCC]], April 09, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71209 Lc0 question] by [[Larry Kaufman]], [[CCC]], July 06, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=71651 Some newbie questions about lc0] by [[Pham Hong Nguyen|Nguyen Pham]], [[CCC]], August 25, 2019* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71686 Lc0 Evaluation Explanation] by Hamster, [[CCC]], August 29, 2019: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71686&start=14 Re: Lc0 Evaluation Explanation] by [[Alexander Lyashuk]], [[CCC]], September 03, 2019
* [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]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72640 Best Nets for Lc0 Page] by [[Ted Summers]], [[CCC]], December 23, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72685 Correct LC0 syntax for multiple GPUs] by [[Dann Corbit]], [[CCC]], December 30, 2019
=Blog Posts=
==2018==
* [https://medium.com/oracledevs/lessons-from-implementing-alphazero-7e36e9054191 Lessons From Implementing AlphaZero] by [https://medium.com/@akprasad Aditya Prasad], [https://blogs.oracle.com/ Oracle Blog], June 05, 2018
: [https://medium.com/oracledevs/lessons-from-alphazero-connect-four-e4a0ae82af68 Lessons from AlphaZero: Connect Four] by [https://medium.com/@akprasad Aditya Prasad], [https://blogs.oracle.com/ Oracle Blog], June 13, 2018
* [http://blog.lczero.org/2018/11/lc0-v0190-has-been-released.html c0 v0.19.0 has been released] by [[Alexander Lyashuk|crem]], [[Leela Chess Zero|LCZero blog]], November 9, 2018
* [http://blog.lczero.org/2018/12/alphazero-paper-and-lc0-v0191.html AlphaZero paper, and Lc0 v0.19.1] by [[Alexander Lyashuk|crem]], [[Leela Chess Zero|LCZero blog]], December 07, 2018
==2019==
* [https://blog.lczero.org/2019/05/lc0-won-tcec-15.html Lc0 won TCEC 15] by [[Alexander Lyashuk|crem]], [[Leela Chess Zero|LCZero blog]], May 28, 2019 » [[TCEC Season 15]]
* [https://blog.lczero.org/2019/07/end-of-era.html End of era] by [[Alexander Lyashuk|crem]], [[Leela Chess Zero|LCZero blog]], July 26, 2019
* [https://blog.lczero.org/2019/12/lc0-v0230-has-been-released.html Lc0 v0.23.0 has been released] by [[Alexander Lyashuk|crem]], [[Leela Chess Zero|LCZero blog]], December 01, 2019
=External Links=
* [https://www.youtube.com/watch?v=Crwg2oT9KWE Leela reacts beautifully to Stockfish's outrageous opening greed] by [https://www.youtube.com/channel/UCDUDDmslypVXYoUsZafHSUQ kingscrusher], January 05, 2019, [https://en.wikipedia.org/wiki/YouTube YouTube] Video
* [http://www.chessdom.com/interview-with-alexander-lyashuk-about-the-recent-success-of-lc0/ Interview with Alexander Lyashuk about the recent success of Lc0], [[Chessdom]], February 6, 2019 » [[TCEC Season 14]]
* [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
==Misc==
* [https://en.wikipedia.org/wiki/Leela Leela from Wikipedia]
* [https://en.wikipedia.org/wiki/Leela_(Doctor_Who) Leela (Doctor Who) from Wikipedia]
* [https://en.wikipedia.org/wiki/Leela_(Futurama) Leela (Futurama) from Wikipedia]
* [[:Category:Weather Report|Weather Report]] - [https://en.wikipedia.org/wiki/Mysterious_Traveller Mysterious TravellerLive_in_Tokyo_(Weather_Report_album) Vertical Invader / T.H. / Dr. Honoris Causa], album [https://en.wikipedia.org/wiki/I_Sing_the_Body_Electric_(album) I Sing the Body Electric] (19741972), [https://en.wikipedia.org/wiki/YouTube YouTube] Video : {{#evu:https://www.youtube.com/watch?v=uu79Lq-3McgTTJwf4cCUwI|alignment=left|valignment=top}}
=References=
[[Category:Open Source]]
[[Category:GPL]]
[[Category:GPU]]
[[Category:NN]]
[[Category:PC]]
[[Category:Windows]]
[[Category:Linux]]
[[Category:Mac]]
[[Category:Fiction]]
[[Category:Given Name]]
[[Category:Weather Report]]
[[Category:Wayne Shorter]]
[[Category:Joe Zawinul]][[Category:Miroslav Vitouš]][[Category:Alphonso Johnson]]
[[Category:Dom Um Romão]]
