Author: José Carlos
Date: 05:52:16 01/09/03
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On January 08, 2003 at 15:34:28, Uri Blass wrote: >On January 08, 2003 at 15:18:18, Roger D Davis wrote: > >>We occasionally see posts where engines take turns playing the Nunn positions, >>the idea being to give the engines an equal footing, but with some development. >>But has anyone looked at whether white or black wins more often for each Nunn >>position? Presumably, if white wins some 55% of the time for all openings (or >>whatever the figure it, consult your database), then the same should hold true >>for the Nunn positions: Given equal engines, white should win 55% of the time. >> >>Some large inequality between white or black would indicate that a particular >>position ought to be deleted from the set, or some other position substituted. >> >>Roger > >The engine use white and black for both sides so I do not see the problem even >in case that there are positions when white get 60% The argument of using black and white for each engine is only valid for equal positions. An extreme example would be a position where white forces mate in 3. All programs would look same strength as all would do 50% using white and black. So Roger's point is valid: are Nunn positions equal (or close) for black and white? I don't have the answer because I've never seen Nunn positions. José C. >and I can promise you that >in no poition white get something close to 100%. > >Uri
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