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** Minimizing the [https://en.wikipedia.org/wiki/Cross_entropy cross entropy] loss of a [[Automated Tuning#LogisticRegression|Logistic Regression]] model for each phase
** Training converges fast due to [https://en.wikipedia.org/wiki/Linear_model linear model] at the heart
* As of '''Winter 0.6.2''', the evaluation function relies on a [[Neural Networks|neural network]] with two main parts. The first part is a non-standard [[Neural Networks#Convolutional|convolutional neural network]] which uses sparsity similarly to [[NNUE]]. This convolutional network is used to calculate [[Pawn Structure|pawn structure]] features, so the output can be reused very often as it gets stored in a separate [[Pawn Hash Table|hash table]] with a high hitrate. The second part is a fully connected network which has as input the output of the convolutional network as well as a set of handcrafted features standard to classical engines, mostly a subset of the features from before neural networks were added to Winter <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74531&start=5 Re: NNUE accessible explanation] by [[Jonathan Rosenthal]], [[CCC]], July 24, 2020</ref>
==Misc==
* [[Perft]]
=Forum Posts=
==2017 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=65466&start=4 Re: Tapered Eval between 4 phases] by [[Jonathan Rosenthal]], [[CCC]], October 16, 2017 » [[Tapered Eval]]
* [http://www.talkchess.com/forum/viewtopic.php?t=66266 Winter Released] by [[Jonathan Rosenthal]], [[CCC]], January 08, 2018
: [http://www.talkchess.com/forum/viewtopic.php?t=66266&start=7 Re: Winter Released] by [[Jonathan Rosenthal]], [[CCC]], January 09, 2018
: [http://www.talkchess.com/forum/viewtopic.php?t=66266&start=8 Windows version released] by [[Jonathan Rosenthal]], [[CCC]], January 23, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68266 Winter 0.2 Release Overview and Select Games] by [[Jonathan Rosenthal]], [[CCC]], Auguat August 20, 2018* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=69288 Winter 0.3 Release Overview and Select Games] by [[Jonathan Rosenthal]], [[CCC]], December 16, 2018» [[TCEC Season 14]]* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72284 Winter NN Training Script] by [[Jonathan Rosenthal]], [[CCC]], November 09, 2019==2020 ...==* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74531&start=5 Re: NNUE accessible explanation] by [[Jonathan Rosenthal]], [[CCC]], July 24, 2020 » [[NNUE]]* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75301 Winter] by [[Jonathan Rosenthal]], [[CCC]], October 05, 2020: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75301&start=14 Re: Winter] by [[Jonathan Rosenthal]], [[CCC]], July 09, 2021
=External Links=
==Chess Engine==
* [https://github.com/rosenthj/Winter GitHub - rosenthj/Winter: UCI Chess Engine]
* [http://ccrl.chessdom.com/ccrl/4040/cgi/compare_engines.cgi?family=Winter&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 Winter] in [[CCRL|CCRL 40/15]]
==Misc==
* [https://en.wikipedia.org/wiki/Winter Winter from Wikipedia]
* [https://en.wikipedia.org/wiki/Edward_Winter_%28chess_historian%29 Edward Winter (chess historian) from Wikipedia]
* [[:Category:Johnny Winter|Johnny Winter]] - Winter Ballade, [https://en.wikipedia.org/wiki/Institut_national_de_l%27audiovisuel ina.fr] 1970, [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: feat. [https[://en.wikipedia.org/wiki/Tommy_Shannon Category:Tommy Shannon|Tommy Shannon]] on bass and [http://yeech.altervista.org/Band/winter_band_john_turner.html Uncle John Turner] on drums
: {{#evu:https://www.youtube.com/watch?v=8P0wdTKMDyo|alignment=left|valignment=top}}
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:UCI]]
[[Category:Open Source]]
[[Category:GPL]]
[[Category:X86]]
[[Category:X64]]
[[Category:ARM]]
[[Category:PC]]
[[Category:Android]]
[[Category:Linux]]
[[Category:Windows]]
[[Category:NN]]
[[Category:OpenBench]]
[[Category:Johnny Winter]]
[[Category:Tommy Shannon]]
