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Subject: Re: Explosion in WAC 102

Author: Sune Fischer

Date: 03:18:47 01/12/02

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On January 11, 2002 at 14:12:58, Martin Giepmans wrote:

>>>I don't know if I understand your question.
>>>How can you reach depth 8 when a mate is found at depth 1 or 2?
>>>Doesn't your engine stop in such a case?
>>>Even if you want to look for a shorter mate, searching *deeper* is of course
>>>useless ...
>>
>>  That's wrong. You can find a mate in 5 at depth 2, but you can't be sure there
>>isn't a shorter mate until you finish ply 9, supposed you don't do some risky
>>prunning. If you do null move, for example, you may need to search beyond that
>>to find a shorter mate.
>>
>>  José C.
>>
>Ah, what i meant was: searching deeper than the length of the mate-pv.
>In this case the pv is 5 ply, so depth 8 is way too much.
>
>Martin

To be honest I'm not sure what he means either, but he must be talking about the
rest of the tree, because that branch will end at ply 5.
I can't search deeper than the first mate I find, my search simply returns with
the mate score, maybe it is somehow connected to the explosion?

-S.
>
>
>
>>>Anyway, if the search explodes after a mate is found, I guess there must also be
>>>something wrong with the hashtable.
>>>
>>>Martin



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