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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=
==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://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]
