Difference between revisions of "Asymmetric Evaluation"
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| − | [[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| [[ | + | [[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], part of [[:Category:Industrial Heritag Trail|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> . | 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> . | ||
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Revision as of 14:54, 27 June 2018
Home * Evaluation * Asymmetric Evaluation
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] .
Contents
See also
Publications
- Ingo Althöfer (1992). On Asymmetries in Chess Programs. ICCA Journal, Vol. 15, No. 1
- Javier Ros Padilla (1994). Estimating Asymmetry and Selectivity in Chess Programs. ICCA Journal, Vol. 17, No. 1 [4]
Forum Posts
1997 ...
- asymmetry by Andrew Tridgell, rgcc, August 12, 1997 » KnightCap, Parity Pruning
- Re: Junior's long lines: more data about this... by Don Dailey, CCC, December 26, 1997
- Genius' asymmetric-search by example: TRY yourself by Thorsten Czub, rgcc, December 30, 1997
- Asymetric king safety by Tom King, rgcc, March 13, 1999
2000 ...
- Parity of depth level and evaluation by Claude Le Page, CCC, June 13, 2005
2010 ...
- evaluating color agnostic terms by Alvaro Cardoso, CCC, October 15, 2013
- Different eval for white/black by Matthew Lai, CCC, January 05, 2015
- Asymmetrical evaluation by Laurie Tunnicliffe, CCC, May 24, 2016 » Odd-Even Effect
- Symmetrical evaluation and endgame by Hamfer, OpenChess Forum, June 02, 2016 » Tempo
References
- ↑ Henry Moore - Helmed Head N° 2 (1950), Bronze on Marble slab, Art Museum, Bochum, North Rhine-Westphalia, Germany, part of The Industrial Heritage Trail of the Ruhr area, Photo by Gerd Isenberg, October 30, 2016, see also 2011 image of the sculpture at Art Gallery of New South Wales from Wikimedia Commons
- ↑ Genius' asymmetric-search by example: TRY yourself by Thorsten Czub, rgcc, December 30, 1997
- ↑ Kaare Danielsen (1987). The 7th World Microcomputer Chess Championship, Rome, Italy, September 14-20, 1987. ICCA Journal, Vol. 10, No. 3 » WMCCC 1987
- ↑ ICCA Journal, Vol. 17, No. 1 by Jos Uiterwijk, rgcc, May 02, 1994
