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Subject: Re: Quiescence Explosion

Author: David Rasmussen

Date: 11:19:27 11/26/02

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On November 26, 2002 at 11:56:59, Sune Fischer wrote:

>On November 26, 2002 at 11:38:40, David Rasmussen wrote:
>
>>On November 26, 2002 at 10:28:24, Sune Fischer wrote:
>>
>>>
>>>You must have some extension that goes mad, like a threat extension or
>>>something. I get around 55% qnodes, so you are right it is high but not _that_
>>>high.
>>>
>>
>>An extension? They're Q-nodes, and I don't "extend" in Q-search.
>
>I know, but you might have some extension that guides the position into
>something extremely tactical. Doesn't sound logical, but who knows if it's
>possible in a rare situation.
>

Maybe. Sounds odd though. I don't see this kind of behavior usually.

>
>>00:00:12.47 6313kn 07/10/21 ---------------------------------------------------
>>00:00:28.12   14Mn 08/11/22   6/48 19. Rae1
>>
>>        Time used: 00:00:30.00
>>        nps: 497701     nodes: 14936023 Q-nodes: 14513023 (97%)
>>        move order: 88%
>>        hash probes: 112554     hash hits: 26981 (23%)  hash usage: 2%
>>        pawn hash probes: 14816435      pawn hash hits: 14807848 (99%)
>>        EGTB probes: 0  EGTB hits: 0 (0%)
>
>normal nodes: 14936023 - 14513023 = 432000
>
>So thats: 14513023 / 432000 >= 33 !?
>
>That's more than 33 captures per leaf node, that's a lot I think.

The 432000 are interior nodes and leaf nodes. Not all leaf nodes. But I guess
that just makes it even worse. But then again, with 97% qnodes, this ratio has
got to be extreme. The question is: why?

>Are you sure you haven't reversed a sign on the move ordering of these captures?
>

I can't imagine so, since I haven't encountered something like this before, and
my qsearch generally behaves nicely. If my move order was upside down, it would
show always.

/David



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