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

Author: Dann Corbit

Date: 12:33:20 01/30/02

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On January 30, 2002 at 15:26:46, Uri Blass wrote:

>On January 30, 2002 at 14:56:00, Dann Corbit wrote:
>
>>On January 30, 2002 at 14:47:42, Uri Blass wrote:
>>[snip]
>>>Yes but I understood that Deeper blue did not use pruning except maybe qsearch
>>>and most of the nodes in the tree are not qsearch nodes.
>>
>>On whose testimony do you base this assumption?
>
>I based my assumption on the knowledge that Hsu was against pruning and he never
>published information about other ways of pruning when there is information
>about singular extensions and even extensions when there are only 2 good moves.

If Hsu said that they did not prune, then it is possible I misunderstood what
Murray Campbell was saying.  The discussions were not terribly technical and I
may have been reading between the lines.

On the other hand, I also have heard the explanation of the logs in the same way
that Robert had.

So, I don't have any possible explanations.  Maybe they used a random number
generator to fill out the depth numbers.
;-)



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