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Subject: Thinking out eval improvements and a test pos.

Author: GeoffW

Date: 15:21:51 08/06/04


Hi

My program has been playing some test games against Dorky and getting soundly
beaten, it got me thinking about my eval function which is pretty dumb and badly
in need of some chess knowledge !

What I noticed in some of the games was that Dorky was seeing threats sometimes
10 or 15 plies earlier than my program, as we were searching to similar depths
it could only be that Dorky has much better eval function.

Here is one of the positions that showed this effect, material is even, but
black looks to me to be in a horrible position

[D]1b3rk1/4qb1p/2r1pRpP/2ppP1P1/P3pQB1/1PB1P3/8/5RK1 b - - 9 44

My program (Black)reckoned that it was only 0.25 of a pawn down, where as Dorky
reckoned white was winnning by 2.2.

I tried this position with a few programs, only Dorky and Crafty scored white
ahead by > 1.5 pawns.

Any suggestions as to what the important factors are to evaluate this position
as strongly good for white ?
My program hasnt really got any mobility scoring, no king tropism and rather
basic pawn structure eval. Wondering which area I ought to try first ?

   Regards Geoff





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