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Subject: Re: next deep blue

Author: Jeremiah Penery

Date: 16:29:31 01/23/00

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On January 23, 2000 at 15:19:14, Tom Kerrigan wrote:

>On January 23, 2000 at 14:57:16, Jeremiah Penery wrote:
>
>>How fast does CS-Tal run on a fast machine?  Less than 20k NPS, I think.  DB is
>>supposed to have a bunch more evaluation, which would probably make it a bunch
>>slower.
>
>No, the only reason you think DB has a bunch more evaluation is because Hyatt

It has nothing to do with Hyatt.  Please try to construct better arguments in
the future.  The reason I think DB has a better evaluation is that I've seen the
games, and analyzed them.  Kasparov and other GMs have said that DB was clearly
superior to anything else they've seen.

>keeps saying that it does. But none of us has any proof that DB has more
>evaluation than CS Tal. And Hsu doesn't even think it has more evaluation,
>because his estimate translates to at least 20k NPS.

That was an estimate.  He could have very well been way off, though it's not
that likely.

>>>I don't see why a terrific evaluation function would be right at one depth and
>>>wrong at another.
>>If you write an evaluation with a 5-ply search in mind, what will you do
>>differently than if you have a 14 ply search with tons of extensions in mind?
>>Will you really put the same knowledge with the same weights in?
>
>But the point is that DB's evaluation is terrific. In fact, it's so terrific
>that DB running at 100k NPS can stomp all over micros. So you're right, the
>evaluation function may be tuned for a 14 ply search, but it's reportedly
>wonderful enough that depth doesn't make a big difference.

Against the current group of micro programs, which lack a great deal of the
knowledge DB has anyway, it probably didn't matter much.  Against humans (GMs),
it would probably matter a lot more.  They could exploit any holes uncovered by
an untuned evaluation much better than other programs.



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