Difference between revisions of "Koivisto"
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'''[[Main Page|Home]] * [[Engines]] * Koivisto''' | '''[[Main Page|Home]] * [[Engines]] * Koivisto''' | ||
− | [[FILE:Hjalmar Munsterhjelm - Koivikko ja ruispelto - A II 1169 - Finnish National Gallery.jpg | + | [[FILE:Hjalmar Munsterhjelm - Koivikko ja ruispelto - A II 1169 - Finnish National Gallery.jpg|border|right|thumb| [[:Category:Hjalmar Munsterhjelm|Hjalmar Munsterhjelm]] - Koivikko ja ruispelto |
<ref>[[:Category:Hjalmar Munsterhjelm|Hjalmar Munsterhjelm]] - Koivikko ja ruispelto (Birch and rye field), 1876, [https://en.wikipedia.org/wiki/Finnish_National_Gallery Finnish National Gallery], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]] | <ref>[[:Category:Hjalmar Munsterhjelm|Hjalmar Munsterhjelm]] - Koivikko ja ruispelto (Birch and rye field), 1876, [https://en.wikipedia.org/wiki/Finnish_National_Gallery Finnish National Gallery], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]] | ||
'''Koivisto''',<br/> | '''Koivisto''',<br/> | ||
− | an [[UCI]] compliant [[:Category:Open Source|open source]] chess engine by [[Finn Eggers]] | + | an [[UCI]] compliant [[:Category:Open Source|open source]] chess engine by [[Kim Kåhre]], [[Finn Eggers]] and [[Eugenio Bruno]], written in [[Cpp|C++]], |
and first released on [https://en.wikipedia.org/wiki/GitHub GitHub] in September 2020 under the [[Free Software Foundation#GPL|GPL v3.0]]. | and first released on [https://en.wikipedia.org/wiki/GitHub GitHub] in September 2020 under the [[Free Software Foundation#GPL|GPL v3.0]]. | ||
The [[Bitboards|bitboard]] engine provides [[Automated Tuning|automated evaluation tuning]] by [[Automated Tuning#LogisticRegression|logistic regression]], | The [[Bitboards|bitboard]] engine provides [[Automated Tuning|automated evaluation tuning]] by [[Automated Tuning#LogisticRegression|logistic regression]], | ||
either using [https://en.wikipedia.org/wiki/Stochastic_gradient_descent stochastic gradient descent] or [https://en.wikipedia.org/wiki/Stochastic_gradient_descent#AdaGrad AdaGrad]. | either using [https://en.wikipedia.org/wiki/Stochastic_gradient_descent stochastic gradient descent] or [https://en.wikipedia.org/wiki/Stochastic_gradient_descent#AdaGrad AdaGrad]. | ||
− | However | + | However, the current [[Neural Networks#Perceptron|perceptron]] approach of the [[Evaluation|evaluation]] may soon be replaced by an own [[NNUE]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75001&start=4 Re: Koivisto] by [[Finn Eggers]], [[CCC]], September 04, 2020</ref> <ref>[https://github.com/Luecx/Koivisto/commits/master/src_files/nn History for src_files/nn - Luecx/Koivisto · GitHub]</ref>. |
=Features= | =Features= | ||
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* [[Magic Bitboards]] | * [[Magic Bitboards]] | ||
==[[Search]]== | ==[[Search]]== | ||
+ | * [[Lazy SMP]] (2.0) | ||
* [[Iterative Deepening]] | * [[Iterative Deepening]] | ||
+ | * [[Aspiration Windows]] (3.0) | ||
* [[Principal Variation Search]] | * [[Principal Variation Search]] | ||
* [[Transposition Table]] | * [[Transposition Table]] | ||
Line 56: | Line 58: | ||
** [[Isolated Pawn]] | ** [[Isolated Pawn]] | ||
** [[Passed Pawn]] | ** [[Passed Pawn]] | ||
+ | ** [[Blockade of Stop]] (3.0) | ||
** [[Backward Pawns (Bitboards)|Backward Pawns]] | ** [[Backward Pawns (Bitboards)|Backward Pawns]] | ||
** [[Open Pawns (Bitboards)|Open Pawns]] | ** [[Open Pawns (Bitboards)|Open Pawns]] | ||
Line 61: | Line 64: | ||
** [[King Safety#Attacking|Attacking King Zone]] | ** [[King Safety#Attacking|Attacking King Zone]] | ||
** [[King Safety#KingTropism|King Tropism]] | ** [[King Safety#KingTropism|King Tropism]] | ||
+ | ** [[Castling Rights]] (3.0) | ||
+ | * [[Tempo]] (3.0) | ||
+ | * [[Draw Evaluation]] (3.0) | ||
* [[Float]] [[SSE|SSE]] [https://en.wikipedia.org/wiki/Dot_product Dot products] <ref>[https://en.wikipedia.org/wiki/Dot_product Dot products] using [https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_mul_ps&expand=3928 _mm_mul_ps], [https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_add_ps&expand=3928,133 _mm_add_ps]</ref> | * [[Float]] [[SSE|SSE]] [https://en.wikipedia.org/wiki/Dot_product Dot products] <ref>[https://en.wikipedia.org/wiki/Dot_product Dot products] using [https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_mul_ps&expand=3928 _mm_mul_ps], [https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_add_ps&expand=3928,133 _mm_add_ps]</ref> | ||
* [[Automated Tuning]] by [[Automated Tuning#LogisticRegression|Logistic Regression]] | * [[Automated Tuning]] by [[Automated Tuning#LogisticRegression|Logistic Regression]] | ||
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: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=357 Re: New engine releases 2020] by [[Finn Eggers]], [[CCC]], September 03, 2020 | : [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=357 Re: New engine releases 2020] by [[Finn Eggers]], [[CCC]], September 03, 2020 | ||
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75001 Koivisto] by [[Gerd Isenberg]], [[CCC]], September 04, 2020 | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75001 Koivisto] by [[Gerd Isenberg]], [[CCC]], September 04, 2020 | ||
+ | : [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75001&start=4 Re: Koivisto] by [[Finn Eggers]], [[CCC]], September 04, 2020 | ||
+ | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75052 Koivisto 2.0] by [[Finn Eggers]], [[CCC]], September 08, 2020 | ||
+ | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75423 Koivisto 3.0 (Including binaries)] by [[Kim Kåhre]], [[CCC]], October 17, 2020 | ||
+ | * [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75742 Koivisto v4.0 release] by [[Eugenio Bruno]], [[CCC]], November 09, 2020 | ||
=External Links= | =External Links= | ||
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[[Category:X64]] | [[Category:X64]] | ||
[[Category:PC]] | [[Category:PC]] | ||
+ | [[Category:OpenBench]] | ||
[[Category:Plant]] | [[Category:Plant]] | ||
[[Category:Hjalmar Munsterhjelm]] | [[Category:Hjalmar Munsterhjelm]] |
Revision as of 12:32, 27 November 2020
Koivisto,
an UCI compliant open source chess engine by Kim Kåhre, Finn Eggers and Eugenio Bruno, written in C++,
and first released on GitHub in September 2020 under the GPL v3.0.
The bitboard engine provides automated evaluation tuning by logistic regression,
either using stochastic gradient descent or AdaGrad.
However, the current perceptron approach of the evaluation may soon be replaced by an own NNUE [2] [3].
Contents
Features
Board Representation
Search
- Lazy SMP (2.0)
- Iterative Deepening
- Aspiration Windows (3.0)
- Principal Variation Search
- Transposition Table
- Move Ordering
- Selectivity
Evaluation
- Tapered Eval
- Piece-Square Tables of floats
- Mobility
- Tactical Patterns
- Evaluation Patterns
- Pawn Structure
- King Safety
- Tempo (3.0)
- Draw Evaluation (3.0)
- Float SSE Dot products [4]
- Automated Tuning by Logistic Regression
Misc
- Syzygy Bases via Fathom
Forum Posts
- Re: New engine releases 2020 by Finn Eggers, CCC, September 02, 2020
- Re: New engine releases 2020 by Finn Eggers, CCC, September 03, 2020
- Koivisto by Gerd Isenberg, CCC, September 04, 2020
- Re: Koivisto by Finn Eggers, CCC, September 04, 2020
- Koivisto 2.0 by Finn Eggers, CCC, September 08, 2020
- Koivisto 3.0 (Including binaries) by Kim Kåhre, CCC, October 17, 2020
- Koivisto v4.0 release by Eugenio Bruno, CCC, November 09, 2020
External Links
Chess Engine
Misc
References
- ↑ Hjalmar Munsterhjelm - Koivikko ja ruispelto (Birch and rye field), 1876, Finnish National Gallery, Wikimedia Commons
- ↑ Re: Koivisto by Finn Eggers, CCC, September 04, 2020
- ↑ History for src_files/nn - Luecx/Koivisto · GitHub
- ↑ Dot products using _mm_mul_ps, _mm_add_ps