Computer Chess Club Archives




Subject: Re: Spike-Rybka

Author: Ryan B.

Date: 12:48:59 12/28/05

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On December 28, 2005 at 12:52:33, Vasik Rajlich wrote:

>On December 28, 2005 at 04:00:14, Ryan B. wrote:
>>On December 28, 2005 at 03:12:23, Vasik Rajlich wrote:
>>>Interesting game. I didn't like .. h6 and .. g5 by Rybka in the opening (as I
>>>suspect most human players won't), and there were a few moments in the endgame
>>>where better resistance could have been put up - but these are relatively minor
>>>The biggest issue was the incorrect sacrifice of the h6 pawn. The Rybka static
>>>eval incorrectly gives the following position (and others of a similar type) as
>>>roughly equal:
>>>[D] 8/1b2b1k1/pp1ppp2/nPq5/P1P1P3/2QRNPP1/8/1N2KB1r b - - 0 27
>>>I'll keep to myself my proposed solution. It's a tricky issue and won't be
>>>handled until after the Rybka 1.2 release. If anybody wants to share here, I am
>>>all ears :-)
>>Does your eval give 2, 4, or 5 mobility points to the b7 bishop?  Im just
>>curious about your mobility detection for no important reason.  :-)
>Sorry, I must keep my secrets :) Its quite a bit different in Rybka anyway, but
>of your three numbers, I am very sure two of them are clearly inappropriate.

For accuracy I agree but all 3 are present in different computer chess programs.


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