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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].
Koivisto '''5.0''' in July 2021 replaced the [[Neural Networks#Perceptron|perceptron]] approach of a real-men-evaluation (RME) by an own [[NNUE]] , as of Koivisto '''5.9''', with two layers <ref>[httphttps://www.talkchessgithub.com/forum3Luecx/viewtopic.php?f=2&t=75001&start=4 Re: Koivisto] by [[Finn Eggers]], [[CCC]], September 04, 2020</ref> <ref>[http://www.talkchess.comwiki/forum3Evaluation Evaluation · Luecx/viewtopic.php?f=2&t=77664 Koivisto 5.0Wiki · GitHub] by [[Finn Eggers]], [[CCC]], July 07, 2021</ref>.
=Features=
=Forum Posts=
==2020==
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=353 Re: New engine releases 2020] by [[Finn Eggers]], [[CCC]], September 02, 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=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
==2021==
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77664 Koivisto 5.0] by [[Finn Eggers]], [[CCC]], July 07, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77766 Koivisto 6.0] by [[Finn Eggers]], [[CCC]], July 21, 2021
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78560 Koivisto 7.0] by [[Finn Eggers]], [[CCC]], October 31, 2021
==2022==
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=79523 Koivisto 8.0] by [[Finn Eggers]], [[CCC]], March 15, 2022
=External Links=
==Chess Engine==
* [https://github.com/Luecx/Koivisto GitHub - Luecx/Koivisto: UCI Chess engine]
** [https://github.com/Luecx/Koivisto/wiki/Evaluation Evaluation · Luecx/Koivisto Wiki · GitHub]
** [https://github.com/Luecx/Koivisto/wiki/Regression-tests Regression tests · Luecx/Koivisto Wiki · GitHub]
* [https://koivisto-chess.com/ Koivisto Chess]
* [https://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Koivisto&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 Koivisto] in [[CCRL|CCRL 40/15]]
==Misc==
* [https://en.wiktionary.org/wiki/Koivisto Koivisto - Wiktionary]
