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Subject: Re: Diep fullwidth vs Deep Blue fullwidth

Author: Greg Lindahl

Date: 14:02:53 12/21/99

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On December 21, 1999 at 16:18:27, Albert Silver wrote:

>That's correct, he says it was done through software: "During the 1997 match,
>the software search extended the search to about 40 plies along the forcing
>lines, even though the nonextended search reached only about 12 plies." He also
>mentions that "The software portion of the search can be arbitrarily selective
>without slowing down the system."

If you read the beginning of that paragraph, Hsu explicitly says that the 8
plies of software search included forcing. Hsu doesn't say if the final 4 plies
of hardware search included forcing by droping back to software or not. Given
that the chess chips seem to operate in an embarrassingly parallel fashion, I
would suspect that there was no forcing for those plies. Someone could always
ask Hsu...

How important is forcing in shallow plies verses deeper plies? That's easy to
examine using a program.

-- greg



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