Computer Chess Club Archives




Subject: Re: Static evaluation after the "Positional/Real Sacrifice"

Author: Dusan Dobes

Date: 06:13:48 12/03/99

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On December 03, 1999 at 08:49:19, Andrew Williams wrote:

>Over the last few days, I have been fascinated by the discussions on CCC
>about positional sacrifices. Some of the discussion has centred on the value
>assigned to the attack that is obtained after the sacrifice and I was wondering
>how other programs evaluated the position after Hossa's sac:
>r3q1k1/ppp1rp2/2n1b2Q/8/2P5/3B4/PPP2RPP/5RK1 b - - 0 2
>This is after 1. Bxh6 gxh6 2. Qxh6 from the original position posted by
>Peter McKenzie. PostModernist's static evaluation of the position is presented
>below. Essentially, it thinks that White is winning by 0.71. The ATTACKTOTAL
>score is generated by analyzing the squares around the King to see how many of
>them are attacked and what sorts of pieces are attacking them. Please note that
>not all the factors that contribute to PM's score are included in the output
>Could other programmers post similar information? I believe that even an
>overall static evaluation would be interesting.
>Andrew Williams

Phalanx XXI static evaluation scores this position as +3.05 for white.
Material gives -1.5, black king safety +5.76.

Dusan Dobes

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