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'''[[Main Page|Home]] * [[Tuning|Automated Tuning]] * Texel's Tuning Method'''
[[FILE:Texel sheep and gulls on Flat Holm.jpg|border|right|thumb|Texel and Gaviotas stay tuned on [https://en.wikipedia.org/wiki/Flat_Holm Ynys Echni] <ref>[https://en.wikipedia.org/wiki/Texel_%28sheep%29 Texel sheep] and [https://en.wikipedia.org/wiki/Gull gulls], [https://en.wikipedia.org/wiki/Flat_Holm Flat Holm Island], [https://en.wikipedia.org/wiki/Wales Wales], Photo by [http://www.flickr.com/people/8007352@N06 Sam Whitfield], March 20, 2010, [http://commons.wikimedia.org/wiki/Category:Texel_%28sheep%29 Category:Texel (sheep) - Wikimedia Commons]</ref> ]]
* N is the number of test positions.
* Ri is the result of the game corresponding to position i; 0 for black win, '''0.5''' for draw and '''1''' for white win.
* qi or qScore corresponding to position i, is the white relative [[Score|valuescore]] returned by from the chess engine [[Quiescence Search|quiescencesearch]] function. The algorithm assumes the qScore function is [https://en.wikipedia.org/wiki/Deterministic_system deterministic]. If [[Transposition Table|transposition tables]] or the [[History Heuristic|history heuristic]] is used in the qScore function this may not be the case.
* [[FILE:TexelTuneMathSigmoid.jpg|none|middle]] [[FILE:SigmoidTexelTune.gif|right|frameless|link=http://wolfr.am/1al3d5B]]
: <ref>[https://en.wikipedia.org/wiki/Sigmoid_function Sigmoid function from Wikipedia]</ref> <ref>[https://en.wikipedia.org/wiki/Logistic_function Logistic function from Wikipedia]</ref> <ref>see also winning probability W in [[Pawn Advantage, Win Percentage, and ELOElo]]</ref> <ref>[http://wolfr.am/1al3d5B log-linear 1 / (1 + 10^(-s/4)) , s=-10 to 10] plot by [https://en.wikipedia.org/wiki/Wolfram_Alpha Wolfram Alpha]</ref>
* K is a scaling constant.
* [[Arasan#Tuning|Arasan's Tuning]]
* [[Eval Tuning in Deep Thought]]
* [[Michael Buro#GLEM|GLEM]] by [[Michael Buro]]
* [[Gosu]]
* [[Point Value by Regression Analysis]]
* [[RuyTune]]
* [[Wukong JS#TexelTuningVideo|Texel's Tuning Video | Wukong JS]] by [[Maksim Korzh]]
* [[Stockfish's Tuning Method]]
: [http://www.talkchess.com/forum/viewtopic.php?t=50823&start=10 Re: How Do You Automatically Tune Your Evaluation Tables] by [[Álvaro Begué]], [[CCC]], January 08, 2014
* [http://www.talkchess.com/forum/viewtopic.php?t=50823&start=26 The texel evaluation function optimization algorithm] by [[Peter Österlund]], [[CCC]], January 31, 2014
: [http://www.talkchess.com/forum/viewtopic.php?t=50823&start=27 Re: The texel evaluation function optimization algorithm] by [[Álvaro Begué]], [[CCC]], January 31, 2014 » [https://en.wikipedia.org/wiki/Cross_entropy Cross-entropyfrom Wikipedia]
: [http://www.talkchess.com/forum/viewtopic.php?t=50823&start=40 Re: The texel evaluation function optimization algorithm] by [[Peter Österlund]], [[CCC]], February 05, 2014
: [http://www.talkchess.com/forum3/viewtopic.php?t=50823&start=70 Re: The texel evaluation function optimization algorithm] by [[Álvaro Begué]], [[CCC]], Mar 04, 2014 » [https://en.wikipedia.org/wiki/Regularization_(mathematics) Regularization from Wikipedia]
* [https://groups.google.com/forum/#!topic/fishcooking/QJPG9MS8tCA Texel tuning method] by vdb..., [[Computer Chess Forums|FishCooking]], January 31, 2014 » [[Stockfish]]
* [http://www.talkchess.com/forum/viewtopic.php?t=53657 Tune cut margins with Texel/gaviota tuning method] by [[Fabio Gobbato]], [[CCC]], September 11, 2014
* [http://www.talkchess.com/forum/viewtopic.php?t=57700 test positions for texel tuning] by [[Alexandru Mosoi]], [[CCC]], September 20, 2015
* [http://www.talkchess.com/forum/viewtopic.php?t=58298 Why computing K that minimizes the sigmoid func. value?...] by [[Michael Hoffmann]], [[CCC]], November 19, 2015
: [http://www.talkchess.com/forum/viewtopic.php?t=58298&start=43 Re: Why computing K that minimizes the sigmoid func. value?] by [[Thomas Kolarik]], [[CCC]], November 27, 2015 » [[NirvanaNirvanachess]]
: [http://www.talkchess.com/forum/viewtopic.php?t=58298&start=46 Re: Why computing K that minimizes the sigmoid func. value?] by [[Peter Österlund]], [[CCC]], November 29, 2015
: [http://www.talkchess.com/forum/viewtopic.php?t=58298&start=52 Re: Why computing K that minimizes the sigmoid func. value?] by [[Daniel José Queraltó]], [[CCC]], December 07, 2015 » [[Andscacs]]
* [http://www.talkchess.com/forum/viewtopic.php?t=65799 tuning for the uninformed] by [[Folkert van Heusden]], [[CCC]], November 23, 2017
* [http://www.talkchess.com/forum/viewtopic.php?t=65881 how to create a labeled epd from pgn?] by [[Erin Dame]], [[CCC]], December 02, 2017 » [[Extended Position Description|EPD]], [[Portable Game Notation|PGN]]
'''2018'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=67614 texel tuning] by [[Folkert van Heusden]], [[CCC]], June 01, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=67893 Texel Tuning] by [[Tamás Kuzmics]], [[CCC]], July 03, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=68326 Texel tuning speed] by [[Vivien Clauzon]], [[CCC]], August 29, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=69194 Texel tuning for piece values] by [[Vivien Clauzon]], [[CCC]], December 08, 2018
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74221 Tool and data for Texel Tuning] by [[Ed Schroder|Ed Schröder]], [[CCC]], June 18, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74416 Question on Texel's Tuning Method] by Josh Odom, [[CCC]], July 08, 2020 <ref>[https://en.wikipedia.org/wiki/Central_limit_theorem Central limit theorem from Wikipedia]</ref>
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74877 Evaluation & Tuning in Chess Engines] by [[Andrew Grant]], [[CCC]], August 24, 2020 » [[Ethereal]]
'''2021'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76238 Help with Texel's tuning] by [[Maksim Korzh]], [[CCC]], January 05, 2021
: [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76238&start=15 Re: Help with Texel's tuning] by [[Maksim Korzh]], [[CCC]], January 07, 2021 » [[Wukong JS]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76265 Tapered Evaluation and MSE (Texel Tuning)] by [[Michael Hoffmann]], [[CCC]], January 10, 2021 » [[Tapered Eval]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76288 Training data] by [[Michael Hoffmann]], [[CCC]], January 12, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76380 Texel tuning variant] by [[Ferdinand Mosca]], [[CCC]], January 21, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76465 Reinforcement learning project] by [[Harm Geert Muller]], [[CCC]], January 31, 2021 » [[Reinforcement Learning]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=77420 A hybrid of SPSA and local optimization] by [[Niels Abildskov]], [[CCC]], June 01, 2021 » [[SPSA]]
'''2022'''
* [https://www.talkchess.com/forum3/viewtopic.php?f=7&t=79049&start=127 Re: Devlog of Leorik - A.k.a. how to tune high-quality PSTs from scratch (material values) in 20 seconds] by [[Thomas Jahn]], [[CCC]], March 28, 2022 » [[Automated Tuning]], [[Piece-Square Tables]], [[Leorik]]
=External Links=
=References=
<references />
'''[[Automated Tuning|Up one Level]]'''
