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Subject: Re: Discrepancy between score and PV

Author: Uri Blass

Date: 01:15:58 07/22/03

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On July 21, 2003 at 23:53:48, Normand M. Blais wrote:

>The following position occured in a game between two chess programs (My program
>had white).
>
>[d]r3r1k1/1p3ppp/2n1qn2/p1b1pNB1/3pP3/P2B4/1PP2PPP/R2Q1RK1 w - -
>
>After the game, I decided to let the program analyse the position again just for
>fun. But then I notice that, after finding the correct move, the pv line at
>depth 6 was ending in a checkmate while the score at that depth was 0.02. I
>suspect that this is a bug. Any idea how this could happend?

Did your program show the checkmate in the pv or another interface?

In case that another interface gave the checkmate then it is possible that your
program did not know that the position is a checkmate and evaluated it as 0.02

It is impossible with movei because it use the number of moves to calculate it's
evaluation so there is no chance that it is going to evaluate mate positions as
0.02.

Uri



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