Computer Chess Club Archives




Subject: Re: Adding knowledge to the evaluation, what am I doing wrong?

Author: Anthony Cozzie

Date: 23:51:33 03/13/03

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adding knowledge can do funny things to your chess program.

On one hand, suppose you add some a bonus for a Knight in the center.  Your
program plays Nd5, and sees that the positions resulting are dramatically
better.  Your nodes/depth go down, because null move and such are working for

On the other hand, lets take the same situation.  You are searching, in order,
Na4 Nb5 Nd5.  Without the knowledge, Na4 is selected as the best move, and te
other branches are quickly pruned.  With the knowledge, the program has to
change its mind.  Due to the vagaries of alpha-beta, this requires a lot of


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