Difference between revisions of "Zahak"

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'''[[Main Page|Home]] * [[Engines]] * Zahak'''
 
'''[[Main Page|Home]] * [[Engines]] * Zahak'''
  
[[FILE:zahak_logo.jpeg|border|right|thumb|  <center>Zahak's Logo - Designed by Nasrin Zaza <ref>[https://www.linkedin.com/in/nasrin-zaza Nasrin Zaza · LinkedIn Profile]</ref></center>]]
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[[FILE:zahak_logo.jpg|border|right|thumb|  <center>Zahak's Logo <ref>[https://github.com/amanjpro/zahak#zahak GitHub - amanjpro/zahak: A UCI compatible chess AI in Go - Name]</ref> - Designed by Nasrin Zaza <ref>[https://www.linkedin.com/in/nasrin-zaza Nasrin Zaza · LinkedIn Profile]</ref></center> ]]
  
 
'''Zahak''',<br/>
 
'''Zahak''',<br/>
 
a [[UCI]] compliant [[:Category:Open Source|open source chess engine]] by [[Amanj Sherwany]], written in [[Go]], licensed under the [[Massachusetts_Institute_of_Technology#License|MIT License]] and first released on [https://en.wikipedia.org/wiki/GitHub GitHub] in February 2021 <ref>[https://github.com/amanjpro/zahak/releases/tag/0.0.1 Release Zahak 0.0.1 · amanjpro/zahak · GitHub]</ref>.  
 
a [[UCI]] compliant [[:Category:Open Source|open source chess engine]] by [[Amanj Sherwany]], written in [[Go]], licensed under the [[Massachusetts_Institute_of_Technology#License|MIT License]] and first released on [https://en.wikipedia.org/wiki/GitHub GitHub] in February 2021 <ref>[https://github.com/amanjpro/zahak/releases/tag/0.0.1 Release Zahak 0.0.1 · amanjpro/zahak · GitHub]</ref>.  
Since version 7, Zahak's hand crafted [[Evaluation Function | evaluation function]] is replaced with an [[NNUE | NNUE style]] evaluation, which is trained by a from scratch written trainer, that is written in [[Go]] as well<ref>[https://github.com/amanjpro/zahak-trainer amanjpro/zahak-trainer · GitHub]</ref>. The network is trained on self-play games between different versions of Zahak. As of version 8, Zahak features an own network architecture which consists of 769 input features, that represents all the pieces on the board as well as a feature to represent white-to-move. The training process is thoroughly documented<ref>[https://github.com/amanjpro/zahak/blob/master/training.md Training Documentation · amanjpro/zahak ·  GitHub]</ref>. As of the time of this writing, Zahak is the only [[NNUE]] engine that is written in [[Go]].
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Since version 7, Zahak's hand crafted [[Evaluation Function | evaluation function]] is replaced with an [[NNUE | NNUE style]] evaluation, which is trained by a from scratch written trainer, that is written in [[Go]] as well <ref>[https://github.com/amanjpro/zahak-trainer amanjpro/zahak-trainer · GitHub]</ref>. The network is trained on self-play games between different versions of Zahak. As of version 8, Zahak features an own network architecture which consists of 769 input features, that represents all the pieces on the board as well as a feature to represent white-to-move. The training process is thoroughly documented <ref>[https://github.com/amanjpro/zahak/blob/master/training.md Training Documentation · amanjpro/zahak ·  GitHub]</ref>. As of the time of this writing, Zahak is the only [[NNUE]] engine that is written in [[Go]].
  
Zahak started its first debut in [[TCEC]] in Swiss 2 event of S21<ref>[https://wiki.chessdom.org/TCEC_Swiss_2 TCEC Swiss 2 Wiki]</ref>.
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Zahak started its first debut in [[TCEC]] in Swiss 2 event of S21 <ref>[https://wiki.chessdom.org/TCEC_Swiss_2 TCEC Swiss 2 Wiki]</ref>.
  
==Name==
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=Etymology=
Zahak (or Zahhak or Azhi Dahak) is an evil figure in Iranian/Kurdish/Perisan mythology, evident in ancient Iranian folklore as Azhi Dahāka, the name by which he also appears in the texts of the Avesta. Legend has it, that he had two giant snakes on his shoulders and he had to feed them two human brains on daily basis<ref>[https://en.wikipedia.org/wiki/Zahhak Zahhak · Wikipedia]</ref>.
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Zahak (or Zahhak or Azhi Dahak) is an evil figure in Iranian/Kurdish/Perisan mythology, evident in ancient Iranian folklore as Azhi Dahāka, the name by which he also appears in the texts of the Avesta. Legend has it, that he had two giant snakes on his shoulders and he had to feed them two human brains on daily basis <ref>[https://en.wikipedia.org/wiki/Zahhak Zahhak from Wikipedia]</ref>.
  
 
=Features=
 
=Features=
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** [[Static Exchange Evaluation|SEE]] based Pruning
 
** [[Static Exchange Evaluation|SEE]] based Pruning
 
** [[Late Move Reductions]]
 
** [[Late Move Reductions]]
** [[Late Move Pruning]]
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** [[Futility Pruning#MoveCountBasedPruning|Late Move Pruning]]
 
** [[Quiescence Search]]
 
** [[Quiescence Search]]
 
==[[Evaluation]]==  
 
==[[Evaluation]]==  
 
* [[NNUE]] (>= Zahak 7)
 
* [[NNUE]] (>= Zahak 7)
 
==Misc==
 
==Misc==
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* [[PolyGlot|PolyGlot]] [[Opening Book]]
 
* [[Syzygy Bases]]
 
* [[Syzygy Bases]]
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* [[Principal Variation#MultiPV|MultiPV]]
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* [[Playing Strength|Skill Levels]]
  
 
=Forum Posts=
 
=Forum Posts=
==2021==
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* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76855 Zahak, a GoLang based chess engine] by [[Amanj Sherwany]], [[CCC]], March 13, 2021
* [http://talkchess.com/forum3/viewtopic.php?f=2&t=76855&sid=9c19c86d4a40d94c20f01f0dfb046304 Zahak's announcement] by [[Amanj Sherwany]], [[Computer Chess Forums|CCRL Discussion Board]], March 13, 2021
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=External Links=
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==Chess Engine==
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* [https://github.com/amanjpro/zahak GitHub - amanjpro/zahak: A UCI compatible chess AI in Go]
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* [https://ccrl.chessdom.com/ccrl/4040/cgi/compare_engines.cgi?family=Zahak&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Zahak in CCRL 40/15]
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==Misc==
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* [https://en.wikipedia.org/wiki/Zahhak Zahhak from Wikipedia]
  
 
=References=
 
=References=
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[[Category:Open Source]]
 
[[Category:Open Source]]
 
[[Category:MIT]]
 
[[Category:MIT]]
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[[Category:Go Proglanguage]]
 
[[Category:UCI]]
 
[[Category:UCI]]
 
[[Category:PC]]
 
[[Category:PC]]
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[[Category:Mac]]
 
[[Category:Mac]]
 
[[Category:NNUE]]
 
[[Category:NNUE]]
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[[Category:OpenBench]]
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[[Category:Mythology]]
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[[Category:Demonology]]

Latest revision as of 13:01, 26 November 2021

Home * Engines * Zahak

Zahak's Logo [1] - Designed by Nasrin Zaza [2]

Zahak,
a UCI compliant open source chess engine by Amanj Sherwany, written in Go, licensed under the MIT License and first released on GitHub in February 2021 [3]. Since version 7, Zahak's hand crafted evaluation function is replaced with an NNUE style evaluation, which is trained by a from scratch written trainer, that is written in Go as well [4]. The network is trained on self-play games between different versions of Zahak. As of version 8, Zahak features an own network architecture which consists of 769 input features, that represents all the pieces on the board as well as a feature to represent white-to-move. The training process is thoroughly documented [5]. As of the time of this writing, Zahak is the only NNUE engine that is written in Go.

Zahak started its first debut in TCEC in Swiss 2 event of S21 [6].

Etymology

Zahak (or Zahhak or Azhi Dahak) is an evil figure in Iranian/Kurdish/Perisan mythology, evident in ancient Iranian folklore as Azhi Dahāka, the name by which he also appears in the texts of the Avesta. Legend has it, that he had two giant snakes on his shoulders and he had to feed them two human brains on daily basis [7].

Features

[8]

Board Representation

Search

Evaluation

Misc

Forum Posts

External Links

Chess Engine

Misc

References

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