Difference between revisions of "Asymmetric Evaluation"

From Chessprogramming wiki
Jump to: navigation, search
(Created page with "'''Home * Evaluation * Asymmetric Evaluation''' FILE:HelmedHeadNo2HenryMoore.JPG|border|right|thumb|link=https://commons.wikimedia.org/wiki/File:%27Helmet...")
 
 
(8 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
'''[[Main Page|Home]] * [[Evaluation]] * Asymmetric Evaluation'''
 
'''[[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|Henry Moore]] - Helmed Head N° 2 <ref>[[Arts#HenryMoore|Henry Moore]] - [http://www.kunstmuseumbochum.de/collection/helm-kopf-no-2-1950/ Helmed Head N° 2] (1950), Bronze on Marble slab, [[Arts#ArtMuseumBochum|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> ]]  
+
[[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|  [[:Category:Henry Moore|Henry Moore]] - Helmed Head N° 2 <ref>[[:Category:Henry Moore|Henry Moore]] - [http://www.kunstmuseumbochum.de/collection/helm-kopf-no-2-1950/ Helmed Head N° 2] (1950), Bronze on Marble slab, [[: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],, 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> .  
 
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> .  
Line 14: Line 14:
 
* [[Ingo Althöfer]] ('''1992'''). ''On Asymmetries in Chess Programs.'' [[ICGA Journal#15_1|ICCA Journal, Vol. 15, No. 1]]
 
* [[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>
 
* [[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=  
 
=Forum Posts=  
Line 26: Line 27:
 
* [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=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/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.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.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=  
 
=References=  
 
<references />
 
<references />
 
 
'''[[Evaluation|Up one Level]]'''
 
'''[[Evaluation|Up one Level]]'''
 +
[[Category:Henry Moore]]
 +
[[Category:Art Museum Bochum]]
 +
[[Category:Industrial Heritage Trail]]

Latest revision as of 21:11, 2 July 2020

Home * Evaluation * Asymmetric Evaluation

Henry Moore - Helmed Head N° 2 [1]

Some programs score certain terms differently for the side they are playing and for the opponent. Most often the big terms, like king safety, passed pawn evaluation or 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's programs were famous for their asymmetry in evaluation and forward pruning [2] , which emphasis safety (rules like 'do not start a wild attack, but worry a lot if the opponent does so') [3] .

See also

Publications

Forum Posts

1997 ...

2000 ...

2010 ...

2020 ...

References

  1. Henry Moore - Helmed Head N° 2 (1950), Bronze on Marble slab, Art Museum, Bochum, North Rhine-Westphalia, Germany,, Photo by Gerd Isenberg, October 30, 2016, see also 2011 image of the sculpture at Art Gallery of New South Wales from Wikimedia Commons
  2. Genius' asymmetric-search by example: TRY yourself by Thorsten Czub, rgcc, December 30, 1997
  3. Kaare Danielsen (1987). The 7th World Microcomputer Chess Championship, Rome, Italy, September 14-20, 1987. ICCA Journal, Vol. 10, No. 3 » WMCCC 1987
  4. ICCA Journal, Vol. 17, No. 1 by Jos Uiterwijk, rgcc, May 02, 1994
  5. Re: Different eval for white/black by Ronald de Man, CCC, January 08, 2015

Up one Level