Computer Chess Club Archives




Subject: Re: Rybka's NPS - one presumption

Author: James T. Walker

Date: 06:56:14 02/17/06

Go up one level in this thread

On February 16, 2006 at 20:47:25, vladan wrote:

>After some hot messages about Rybka’s NPS, I must say something (I was told it
>also to my friend Djordje Vidanovic) two months ago.
>It is obvious that Rybka’s NPS is not programs real NPS.
>It is impossible that program with lowest NPS compared to other engines achieves
>depths sand playing strengths above 2850 (or 2900) ELO points, the best of all!
>But, I am not sure that Vasik did purposely tune down real NPS. The only
>explanation for that will be that he tried to hide Rybka’s origin in some other
>public source engines. But Rybka’s plays much different and superior chess,
>which implicates me that Vas however did original and good job with his engine.
>Of course, as he said, he used ideas, maybe some source portions or solutions
>from Fruit, but it is irrelevant if he added (and that is the case) his original
>code somewhere, which amplifies playing strings for a major margin. It is not
>cloning. If it is, all of us are monkey clones (with 95% same DNK with our
>primate relatives :)
>Maybe, Vasik counts not all generated nodes, not only terminal (leaf) nodes
>without quiescent generated ones. Each terminal node expands to 2-20 q-search
>nodes, depended on q-search heuristics (if program has only captures, or checks,
>promotions etc.). This presumption explains why Rybka’s NPS varieties and drops
>significantly in positions where exsist much checks, or recaptures, and stay
>stable at high level in strategically (quit) positions.
>Best regards,

I really do not understand all the "talk" about the NPS of Rybka.  Seems to me
it's important only to idiots who think they can measure a programs strength by
it's NPS.  Maybe they are like another poster here who thinks he can look at a
few games by a progrma and know it's Elo rating.  I suspect there are a few
green programmers here.  I also suspect that someone who would disassemble
another persons program for "fun" is full of B.S.  The bottom line to me is that
if Vas wants to hide his real NPS that's his business and nobody else.  If
that's your major complaint against Rybka/Vas then you need to get a life.  Find
something constructive to do with your time.

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