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Subject: Re: Rybka 1.0 "SP" - Deep Fritz 8 (30.5-9.5); Nunn2; result and games

Author: Vasik Rajlich

Date: 02:48:39 12/08/05

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On December 08, 2005 at 01:05:57, Albert Silver wrote:

>I can't recall Deep Fritz 8 ever looking in such bad shape. It lost even winning
>attacks. Here is one position where I was certain Rybka was done for:
>
>[D]5k1r/pb3q2/1p2p1Rp/3nPp1Q/2r2P2/P5P1/1P2N3/4KB1R w K - 0 32
>
>yet 20 some moves later the position looked like this:
>
>[D]8/p7/1p2p1k1/1P2Pp2/P2r1PnP/5Q1K/R5B1/2q5 b - - 0 56
>
>I think Rybka is a poor name. Houdini seems more appropriate.
>
>Bear in mind that this was played using Rybka's "slightly positional" profile.
>My purpose is to test the other as well under identical conditions in order to
>better see how they differ in terms of performance and style. That, and the fact
>Rybka doesn't have its own book, is why I choose to play with the Nunn2 set.
>CEGT reportes that Rybka suffered a marginal loss to Hiarcs 9 as well as a
>serious one to Chess Tiger 15, so Tiger will be the next opponent in the series.
>Then I'll see what the other styles show.
>
>Athlon64 Sempron 3400+
>Hash: 256 Mb; ponder off
>Time Control: 10min + 2 sec
>Nunn2 Openings set
>
>1   Rybka "SP" Beta 32-bit   +24/-3/=13 76.25   30.5/40
>2   Deep Fritz 8             +3/-24/=13 23.75    9.5/40
>
>The first match against the default "very positional" style yielded
>
>1   Rybka "VP" Beta 32-bit   +18/-10/=12 60.00   24.0/40
>2   Deep Fritz 8             +10/-18/=12 40.00   16.0/40
>
>Bear in mind, one match means nothing so no conclusions other than it is a
>different and interesting style should be inferred.
>
>                                     Albert

I just want to make a comment about the positional vs tactical settings. These
slightly affect the way search is handled. They will not change the general feel
of the program for a human observer. Only different evaluation terms can do
this.

Vas




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