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Subject: Re: Reproducibility of Nunn matches is not so good

Author: Robert Hyatt

Date: 06:39:15 05/02/00

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On May 02, 2000 at 01:10:58, Jouni Uski wrote:

>About one week ago I posted "sensational" blitz Nunn test result Crafty17.10 -
>Fritz6a 12-8. And I wasn't lying! Now I have more time to re-check and second
>match ended 9 - 11 for Fritz. I also repeated two other matches with interesting
>results:
>                           1.              2.
>Crafty 17.10 - Lg2000   13 - 7         9,5 - 10,5
>Fritz6a - Lg2000        13,5 - 6,5     11 - 9
>
>Exact enviroment: AMD 450Mhz, ponder of, 16+16MB hash, 4m+1s level, 3+4+some
>5 piece TBs, Fritz6 interface, early resign.
>
>Conclusion: after 20 games You don't know much yet...
>
>Jouni


one problem is the short time control.  at the above, you probably see some
searches that are targeted for (say) 3.00 seconds.  The way timing is done on
a computer, quantization happens, and you may end up checking the time and being
just short, then checking the time again and being over a bit.  In the case of
Crafty, I try to check the time about 1 time per second for searches > 10
seconds long, about 1 time every 1/10th of a second for shorter searches.  That
means I can vary by .1 seconds out of 1-2-3 second searches.  That is a pretty
significant variance and can change the move.

at 40/2hr, a second doesn't mean much.  at 2 secs/move .1 seconds is a lot.



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