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Subject: how does crafty understand that black is better?

Author: Uri Blass

Date: 07:04:02 04/08/03


[D]8/5pp1/4p1kp/1Q6/2rqP2P/8/5PP1/5RK1 w - - 0 27

This position happened in a game of movei.
For the game see http://f11.parsimony.net/forum16635/messages/46511.htm

I found that latest movei also suffers from the same evaluation problem.

Movei evaluates the position as almost equal.

I found that Crafty and a lot of programs understand that black has a clear
advantage(more than 0.5 pawns for black from the
first iterations).

I understand that black is better but the question is what factor in evaluation
helps a lot of programs to understand it.

I can explain reasons to give advantage for black from program point of view:

1)The black king is more advanced and it is known that the king should
be at the last rank except endgames.

2)The white pawns are more advanced so by piece square table they
get bigger bonus after a move like h5+.

Uri



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