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Subject: Re: Infinite PV's / hash extraction repetition problem

Author: Robert Hyatt

Date: 19:06:51 02/24/03

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On February 24, 2003 at 20:38:31, Sune Fischer wrote:

>On February 24, 2003 at 20:23:07, Robert Hyatt wrote:
>
>>On February 24, 2003 at 20:17:05, Sune Fischer wrote:
>>
>>>Hey there.
>>>
>>>I've dumped the triangle PV and are extracting from hash now.
>>>I'm wondering if what's happening here is normal....
>>>
>>>Sometimes when it finds a repetition it seems to go in a loop creating
>>>infinitely long PV's. What is the right way to handle this, should I cut the PV
>>>after 1st or 2nd rep, or just let it go nuts?
>>
>>Think about it.  If you go thru one loop, you will go thru an infinite number.
>>:)
>
>Yeah thought that was reasonable, but I couldn't figure out if maybe the depths
>on the entries played a role here, but guess they don't.
>
>>Cut the PV at the _first_ repetition.  :)
>
>Okay, so do you print the first repeated move, as in
>1.Qa4+ Bd7 2.Qb3 Be6 3.Qa4+ or just
>1.Qa4+ Bd7 2.Qb3 Be6 ?
>
>>Or else find a way to do int pv[infinity].
>>
>>:)
>
>Hang on, I need a moment to reflect on that one.. :)
>
>-S.

It's a matter of taste of course.  But I lop the thing off after making
and printing the move, and then noticing it is repeated.  That "closes"
the PV so that I can see what is happening.

You have to do this if you print EGTB PVs as well, obviously.  Been there
and debugged that problem too.  :)



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