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Subject: Re: Tiger against Deep Blue Junior: what really happened.

Author: Jeremiah Penery

Date: 13:47:27 07/28/00

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On July 28, 2000 at 16:04:43, Christophe Theron wrote:

>No need to marvel at the singular extension stuff. When you compute 100 times
>faster than your opponent, you kill him anyway. But it's not sexy enough, and

This isn't necessarily true when the opponent is human.  DB was built to play
humans (Kasparov), and the team thought that the regular ideas would not be good
enough to beat him.  They implemented singular (and other) extensions they
thought would help them compete against Kasparov.

>Hsu and co needed something more flashy. Singular extensions does the trick:
>1) it is not done by anybody else (for the good reason that it is ineffective).

Several others have used it.  I know Bruce at least uses it now, and Lang has
used some form of singular extensions in his programs in the past.

>2) we can afford to use it as we are so superior in NPS anyway.

True, and also they thought it was the only way they could compete against
Kasparov.  Because if Kasparov sees deeper than you in some important/forcing
line, he will probably beat you.



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