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Subject: Re: position, ruffian and crafty have problems

Author: Richard Pijl

Date: 03:09:30 03/24/03

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On March 24, 2003 at 02:07:31, Will Singleton wrote:

>Position from Baron – Amateur    bm Qxc2
>[D]2rr3k/pb3ppp/4p3/4P3/1n1B3R/1P4P1/P1q4P/1Q1RKB2 w - - 0 30
>
>For some reason, Ruffian and Crafty have a very tough time with this one.  I
>wonder whether this could be due to some similarity between them.  A problem in
>repetition detection, perhaps?  On my machine, amd 1.6ghz:
>
>            Fail-low  solution
>Yace        0:15      0:20
>CM          0:15      0:30
>Shredder    0:35      0:45
>Amateur     0:20      0:50
>Ruffian     2:34      3:54
>Crafty      5:42      > 9 minutes
>

Baron 0.99.5a also has a tough time finding it. I only have a slow machine here
(Mobile PIII-500) but even considering that it needs too much to find the
solution: 37:28.

Fortunately my current beta version (0.99.6b4) is a lot faster, although still
not fast enough. It gives Qxc2 as the solution after 10:30, which is more or
less on par with Ruffian (considering HW differences).

At the moment my PC at home is playing some matches with a version that is
tactically much stronger (but maybe positionally weaker, I don't know yet), so I
will feed this position into that version too when I get home.

Thanks for posting this position.

Richard.



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