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Subject: Re: next deep blue

Author: Ernst A. Heinz

Date: 11:10:12 01/26/00

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On January 26, 2000 at 00:33:32, Robert Hyatt wrote:
>
> [...]
>
>6.  They _might_ just be very good tree search theoreticians.  I personally
>believe that Hsu and Campbell know as much about alpha/beta searching as any
>of us, and just possibly more...

Oh, I never doubted that and totally agree with you on this point.

But I neither doubt the square-root complexity of the critical
alpha-beta tree.

I know that this is O-calculus complexity and that the critical tree
need not necessarily represent the smallest possible alpha-beta tree
yielding the same root result. That is why I speculated about ETC.

Yet still, the effective branching factors of 3-4 following from the
times cited by you are mysterious ...

=Ernst=



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