Author: Dann Corbit
Date: 14:00:47 03/31/99
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On March 31, 1999 at 16:56:47, Derrick Gatewood wrote: >I have been playing a lot of the same programs against each other lately. I >found something very curious to me. Lets say that on move 13 white gives an >evaluation of +1.13 while the same move for black returns an evaluation of only >-.87 for the same move number before it makes its move. Can anybody explain >this to me? Is it because at any one time, either side is one ply ahead of the >other? They are the same programs so shouldnt they return the same evaluation >value? When it is black's turn to move, it can see one half ply further in the same amount of time, on average. Consider that at some certain time control, white will see ahead 6 full moves. After moving, black can see about the same. But since white has already moved, black sees a tiny bit further. It is also conceivable that the evaluations are not symmetrical. Also, there will be some variation even for the same position run twice. In fact, I get about 1/3 evaluations that are different in ce or pv for setups that are supposedly on identical time control. Usually, the discrepancies are very minor.
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