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Subject: Re: What is the average nodes per second for minimax?

Author: leonid

Date: 18:40:19 06/24/00

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On June 24, 2000 at 15:11:46, blass uri wrote:

>On June 24, 2000 at 15:02:09, blass uri wrote:
>
><snipped>
>>>Alpha-beta can give you very often as much as 15 moves of equal value in the
>>>first half of usual game. I speak all the time about what I call "positional
>>>logic".
>>
>>Alpha beta never gives you more than one move with a value and other moves that
>>you know that they are not better and you have no idea if they are equal or
>>worse.
>
>To be more exact alpha beta is a function that givees you a number (alpha if the
>evaluation of the position after search is worse than alpha,beta if the
>evaluation after search is bigger than beta and a score between alpha and beta
>in other cases.
>
>
>If the evaluation of Na3 after search is 0.00 you are not intereted in the exact
>value of e4 if it is not better than 0.00 and your calculation will give 0.00
>even if e4 is losing material  so you will have no way to know if e4 is losing
>or leads to an equal position.
>
>Uri

Ura, probably all confusion is about the ply number. I speak about upper ply.
Ply where you are forced to see all the moves. It is the place where multiple
moves you can have to chose later.

Leonid.



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