Author: Uri Blass
Date: 06:14:24 01/09/03
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On January 09, 2003 at 08:52:16, José Carlos wrote: >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. I believe that they are close to equal and my point is that I do not care if one position is slightly better for white or for black(I guess that in most of them white and black get more than 40%(maybe even in all of them). Uri
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