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Subject: Re: Mathematical impossibilities regarding Deep Blue statements by Bob

Author: David Rasmussen

Date: 11:53:14 01/30/02

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On January 30, 2002 at 14:45:20, Dann Corbit wrote:

>>
>>But in a normal middlegame situation with a high branching factor, I don't
>>believe it, even if you have 200 Mn/s. As far as I understood, DB _did_ pretty
>>much blindly search "the whole" (of course they used alpha-beta pruning) tree.
>
>Why do you understand that?  I have talked to Murray Campbell and am very sure
>that it is not the case.  On what do you base your understanding?
>

Mainly posts by Hsu in newsgroups. There is a lot of interesting stuff now that
google groups have all the old stuff now :)

>>They had extensions, but as far as I know, no forward pruning of any kind. I
>>might be wrong.
>
>I don't know what kind of pruning they used.  But use it they did.  I also know
>that the search algorithm changes in some way after 30 seconds.

OK, I didn't know that.

/David



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