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Subject: Re: difference in chess program designs ??

Author: Robert Hyatt

Date: 18:00:42 01/15/01

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On January 15, 2001 at 18:13:00, Bas Hamstra wrote:

>On January 15, 2001 at 11:25:53, Robert Hyatt wrote:
>
>>On January 15, 2001 at 10:45:21, Kim Roper Jensen wrote:
>>
>>>Hi
>>>
>>>I just wondered, If u have a slow processor how would u program it to play chess
>>>??
>>>
>>>I mean will u try to create a big eval and hope it selects "good & natural"
>>>moves and have small depths, or do u try make a small eval and hope u can
>>>calculate to a reasonable depth ????
>>>
>>>Or is there no difference in program design, when u program a fast or slow
>>>processor ??
>>>
>>>With regards and thamks in advance
>>>Kim
>>
>>
>>There is definitely a "balance" point between evaluation and search.  If you
>>slow the machine down enough so that the big eval causes the search to be
>>unable to reach a reasonable depth, then you have a positionally smart but
>>tactically stupid program.  The inverse can happen as easily.  Striking a
>>good balance between smarts and tactics is a big issue...
>
>Question is: is that balance different for slow cpu's? And question 2 is: are
>you going to play fast cpu's? That extremely hard to compete anyway. For a game
>between 2 very slow processors I would think the balance would more go to less
>smart, more tactical, faster, than for fast processors. Stuff it with extensions
>and make a Genius. For fast processors that doesn't work.
>
>Bas.


I believe that the cpu speed makes a difference.  I believe that it is
possible (and probable) that if you play program A vs B, where A is designed
and tested to run on a 200mhz processor, and B is designed on a 1ghz processor,
that if both use 200 mhz processors, A will win, and if both use 1ghz
processors, B will win.

I had a similar problem in testing/developing Cray Blitz on a vax, but running
it on a Cray.  It was a real problem.



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