Author: Robert Hyatt
Date: 08:02:11 04/08/03
Go up one level in this thread
On April 08, 2003 at 10:04:02, Uri Blass wrote:
>[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
First (2) is wrong for Crafty. Simply advancing pawns is not particularly good
here
It tends to leave the pawn(s) hanging.
Second, I think this is more related to king safety and piece placement.
White's rook
is stuck at f1, black can make it "stucker" by playing the rook down to attack
the pawn
a second time. White's queen is on the wrong side of the board, while black's
pieces
are free to move anywhere, with the black rook able to reach the 7th rank, and
sit on an
open file as well giving it plenty of options. The black rook and queen also
are in
threatening positions relative to the white king.
All in all, the "static" score from crafty says:
White(1): sc
end-game phase
clearing hash tables
note: scores are for the white side
material evaluation................. 0.00
development......................... 0.00
pawn evaluation..................... 0.06
passed pawn evaluation.............. 0.00
passed pawn race evaluation......... 0.00
king safety evaluation.............. 0.00
interactive piece evaluation........ -0.86
total evaluation.................... -0.80
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