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Subject: Re: Is the NPS for minimax devided by NPS in alpha-beta = 5 ?

Author: leonid

Date: 11:07:06 06/16/00

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On June 16, 2000 at 13:26:28, José de Jesús García Ruvalcaba wrote:

>On June 16, 2000 at 13:16:57, leonid wrote:
>>On June 16, 2000 at 12:34:58, Michel Langeveld wrote:
>>>No nps of alpha-beta and minimax will be almost the same. But the total number
>>>of and the total amount of time will be a much lesser.
>>Your first statement sound to me as something near to impossible. Just recently
>>Bas Hamstra said that minimax speed is around 800000 nodes/second.
>If you read carefully, Bas used alpha-beta.

Here you indicated something that I left without attention. Bas spoke about
material exchange, it is true. I had in sight just this logic. Question now is
if all kind of logics, at minimax, goes approximately at the same speed. If it
their NPS is the same, factor of five is still valid.

At least, in my logic this is just like I said before. In "material exchange" (I
call it positional logic) minimax NPS devided on alpha-beta NPS give around
number five.


>> Computer was
>>indicated as Pentium 466M. Usual number of nodes/second that I see on my AMD
>>400M (for some best chess games like: Crafty, Xchess, Comet...)is around 150000.
>>Even from this I can see that: 800000:150000=5.3 times.
>The difference is because Bas was doing material-only evaluation.

And for material only evaluation?


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