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'''[[Main Page|Home]] * [[Evaluation]] * Asymmetric Evaluation'''
[[FILE:HelmedHeadNo2HenryMoore.JPG|border|right|thumb|link=https://commons.wikimedia.org/wiki/File:%27Helmet_Head_No._2%27,_bronze_sculpture_by_Henry_Moore,_1955,_Art_Gallery_of_New_South_Wales.JPG| [[Arts#HenryMoore:Category:Henry Moore|Henry Moore]] - Helmed Head N° 2 <ref>[[Arts#HenryMoore:Category:Henry Moore|Henry Moore]] - [http://www.kunstmuseumbochum.de/collection/helm-kopf-no-2-1950/ Helmed Head N° 2] (1950), Bronze on Marble slab, [[Arts#ArtMuseumBochum:Category:Art Museum Bochum|Art Museum]], [https://en.wikipedia.org/wiki/Bochum Bochum], [https://en.wikipedia.org/wiki/North_Rhine-Westphalia North Rhine-Westphalia], [https://en.wikipedia.org/wiki/Germany Germany], part of [[Arts#IndustrialHeritageTrail|The Industrial Heritage Trail]] of the [https://en.wikipedia.org/wiki/Ruhr Ruhr area], Photo by [[Gerd Isenberg]], October 30, 2016, see also 2011 [https://commons.wikimedia.org/wiki/File:%27Helmet_Head_No._2%27,_bronze_sculpture_by_Henry_Moore,_1955,_Art_Gallery_of_New_South_Wales.JPG image] of the sculpture at [https://en.wikipedia.org/wiki/Art_Gallery_of_New_South_Wales Art Gallery of New South Wales] from [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
Some programs score certain terms '''differently''' for the [[Side to move|side]] they are playing and for the opponent. Most often the big terms, like [[King Safety|king safety]], [[Passed Pawn|passed pawn evaluation]] or [[Mobility|mobility]] are scaled in some way. Whilst it might be argued that this idea runs counter the definition of chess as a zero-sum game, it also allows greater freedom in shaping the program's playing style. [[Richard Lang|Richard Lang's]] programs were famous for their asymmetry in evaluation and [[Pruning|forward pruning]] <ref>[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/b456400a43207b02 Genius' asymmetric-search by example: TRY yourself] by [[Thorsten Czub]], [[Computer Chess Forums|rgcc]], December 30, 1997</ref> , which emphasis safety (rules like 'do not start a wild attack, but worry a lot if the opponent does so') <ref>[[Kaare Danielsen]] ('''1987'''). ''The 7th World Microcomputer Chess Championship, Rome, Italy, September 14-20, 1987''. [[ICGA Journal#10_3|ICCA Journal, Vol. 10, No. 3]] » [[WMCCC 1987]]</ref> .
* [[Ingo Althöfer]] ('''1992'''). ''On Asymmetries in Chess Programs.'' [[ICGA Journal#15_1|ICCA Journal, Vol. 15, No. 1]]
* [[Javier Ros Padilla]] ('''1994'''). ''Estimating Asymmetry and Selectivity in Chess Programs''. [[ICGA Journal#17_1|ICCA Journal, Vol. 17, No. 1]] <ref>[https://groups.google.com/d/msg/rec.games.chess/5_dMbe0_juo/bXQQVYVEpykJ ICCA Journal, Vol. 17, No. 1] by [[Jos Uiterwijk]], [[Computer Chess Forums|rgcc]], May 02, 1994</ref>
* [[Mathematician#DCarmel|David Carmel]], [[Shaul Markovitch]] ('''1994'''). ''[https://www.semanticscholar.org/paper/The-M*-Algorithm%3A-Incorporating-Opponent-Models-Carmel-Markovitch/bd788272c81951dc44fa7944e0f72451ced14129 The M* Algorithm: Incorporating Opponent Models into Adversary Search]''. CIS Report #9402, [http://www.cs.technion.ac.il/~shaulm/papers/pdf/Carmel-Markovitch-CIS9402.pdf pdf] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=54865&start=27 Re: Different eval for white/black] by [[Ronald de Man]], [[CCC]], January 08, 2015</ref>
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=49719 evaluating color agnostic terms] by [[Alvaro Cardoso]], [[CCC]], October 15, 2013
* [http://www.talkchess.com/forum/viewtopic.php?t=54865 Different eval for white/black] by [[Matthew Lai]], [[CCC]], January 05, 2015
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=57067 Asymmetric evaluation function] by [[Fabio Gobbato]], [[CCC]], July 24, 2015
* [http://www.talkchess.com/forum/viewtopic.php?t=60262 Asymmetrical evaluation] by [[Laurie Tunnicliffe]], [[CCC]], May 24, 2016 » [[Odd-Even Effect]]
* [http://www.open-chess.org/viewtopic.php?f=5&t=2985 Symmetrical evaluation and endgame] by Hamfer, [[Computer Chess Forums|OpenChess Forum]], June 02, 2016 » [[Tempo]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68072 Why Lc0 eval (in cp) is asymmetric against AB engines?] by [[Kai Laskos]], [[CCC]], July 25, 2018 » [[Leela Chess Zero]], [[Pawn Advantage, Win Percentage, and Elo]]
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74081 asymmetric evaluation and TT] by [[Vivien Clauzon]], [[CCC]], June 02, 2020 » [[Transposition Table]]
=References=
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'''[[Evaluation|Up one Level]]'''
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