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Subject: Re: Chess Tiger & Fritz - question re nps vs. chess knowledge

Author: William H Rogers

Date: 11:33:29 06/20/01

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On June 20, 2001 at 14:25:03, John Hatcher wrote:

>Maybe the answer to my question is obvious, but I'd be interested in what
>programmers have to say on the subject.
>
>I've recently been running matches between Fritz6 and Chess Tiger.  On my old
>Celeron 333mhz computer Fritz6 runs at about 250 knps, and Chess Tiger runs at
>about 80-100 knps.  To my delight, and surprise, Chess Tiger is doing very well
>against Fritz - very well.
>
>Since, as I understand it, "nps" is related (at least nominally) to search depth
>in a given time period, it would seem that, all things being equal, the greater
>the "nps" the stronger the program.
>
>Of course, things are never really equal between two programs.  As evidence of
>that, Chess Tiger with its lower nps holds its own quite nicely against Fritz.
>For this to happen it would seem that Chess Tiger must have some chess
>"knowledge" programmed into it that allows it go toe-to-toe with a program that
>searches 2.5x as many positions per second.
>
>Is the programming of this chess knowledge, even among the programmers of top
>commercial programs, still as much art as science so that the programmer of
>Chess Tiger has found a "smarter", more efficient way to implement chess
>knowledge into Chess Tiger.  I guess I supposed that much of this knowledge
>would be common currency by now.
>
>Sorry for the long-winded question.  I wanted to be clear.
>
>JOHN

Chess knowledge is the art and not all programs count nps the same way.
Bill



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