Computer Chess Club Archives




Subject: Re: The Limits of Positional Knowledge

Author: Robert Hyatt

Date: 11:04:25 11/12/99

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On November 12, 1999 at 12:28:26, blass uri wrote:

>On November 12, 1999 at 11:49:12, Robert Hyatt wrote:
>>I believe that 'diminishing returns' does happen, _if_ you take a static engine
>>and run it on faster and faster hardware.
>It is possible that the new programs earn more from fast hardware relative to
>old programs and that this is the reason that I do not see the diminishing
>I compared the difference of the same programs of the ssdf list
>between p200 and p90 and between K6-450 and p200 and I was surprised to find
>that the improvement from K6-450 relative to p200 is bigger than the improvement
>between p200 amd p90
>I admit that it is possible that the programs I compared between K6-450 and p200
>earn more from time and that there is a diminishing return from being twice
>The only way to check it is to use the same programs on 3 different hardware or
>with 3 different speeds.

The main thing I have noticed (often) is that deeper searches require re-tuning
of the eval to play optimally.  I got burned in 1985 for tuning on a vax and
playing on a Cray, and barely found this problem after round two of the 1986
WCCC tournament.

I try to 'play' on what I 'test' on when possible now.  IE I would definitely
feel more at ease playing anyone using my quad xeon, as opposed to a 16-way
alpha machine.  The alpha would be nice, but no telling what kind of eval
glitches might show up with the 2-3 additional plies it would get...

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