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Subject: Re: Are over-optimistically evaluations stronger than realistic evaluati

Author: Uri Blass

Date: 09:02:08 04/28/03

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On April 28, 2003 at 11:51:47, Robert Hyatt wrote:

>On April 28, 2003 at 11:30:08, Charles Worthington wrote:
>
>>That's an interesting question but I have one of my own. Is not the engine's
>>choice of continuations based soley on its eval of the line?
>
>Yes it is.  However, You could take the source for Crafty, and at the top
>of Evaluate() where it computes the material score, you could add PAWN_VALUE*2
>if white is on move, or subtract it if not, and it won't change a thing as far
>as the best move and the PV.  The alpha/beta search simply maximizes the score,
>having no idea what the score really means...

It can change because if Crafty has positive evaluation then it may avoid draw
by and lose the game(I assume that people who talk about over optimistically
evaluation do not mean to change the score for draws otherwise it is really
meaningless to change the evaluation).

Uri
Uri



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