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

Author: Tony Werten

Date: 15:21:53 01/30/02

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On January 30, 2002 at 14:15:32, Dann Corbit wrote:

>On January 30, 2002 at 14:00:32, David Rasmussen wrote:
>
>>On January 30, 2002 at 09:43:49, Vincent Diepeveen wrote:
>>
>>I don't know anything about what Bob has stated, but I agree that 18 ply
>>fullwidth was/is impossible, even with 200 Mn/s.
>>
>>Please email me how you do singular extensions, Vincent. :)
>
>I've done 18 ply searches with a PC.  What makes you think it is impossible for
>a machine that can peak at one billion nodes per second?
>
>They did not use null move, but neither did they blindly search the whole tree.

I'm very sure you didn't get 18 ply fullwidth.

They had a branching factor of 4. You don't get 18 ply with that. Either you
don't have that BF (pruning) or you don't get 18 ply ( just some extensions do)

Tony



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