Difference between revisions of "Koivisto"
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'''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 [[Finn Eggers]] and [[Kim Kåhre]], 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]], | ||
| Line 16: | Line 16: | ||
* [[Magic Bitboards]] | * [[Magic Bitboards]] | ||
==[[Search]]== | ==[[Search]]== | ||
| + | * [[Lazy SMP]] (2.0) | ||
* [[Iterative Deepening]] | * [[Iterative Deepening]] | ||
* [[Principal Variation Search]] | * [[Principal Variation Search]] | ||
| Line 71: | Line 72: | ||
* [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=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 | ||
=External Links= | =External Links= | ||
Revision as of 20:35, 9 September 2020
Koivisto,
an UCI compliant open source chess engine by Finn Eggers and Kim Kåhre, 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
- 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
- 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
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
