Author: David Dahlem
Date: 13:35:02 01/08/03
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On January 08, 2003 at 15:40:21, Rajen Gupta 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 > >i see the point that you are trying to make ie that there maybe some positions >that are not strictly neutral to begin with; however each engine gets an equal >bite at the cherry so to speak and even if a particular position were to >inherently favour one colour, both engines get to play that colour and the final >result depends upon which engine can win more often; so i guess the nunn >positions are a pretty good test for evaluating engines; however the valid >argument is that programmers can tune their engines to perfom well on these >tests; I mostly agree with the above, with one exception. Unequal starting positions would give an advantage to the weaker engine, depending upon the unequality of the position. What i mean is where it might lose from an equal start, it could win or draw from an unequal position, giving results that may not be reliable. This is just my inexpert opinion. :-) Regards Dave
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