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Subject: Re: Whither Null Move?

Author: Antonio Dieguez

Date: 07:44:42 08/22/01

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On August 21, 2001 at 11:48:23, Georg v. Zimmermann wrote:

>On August 20, 2001 at 12:02:11, Antonio Dieguez wrote:
>
>>On August 20, 2001 at 01:03:30, Georg v. Zimmermann wrote:
>>
>>...
>>>nullscore = -search(-beta, -beta+1, depth-3, 1);
>>>
>>>=> he is using R=2
>>>
>>>Georg
>>
>>oops am I missing something?
>>The search here recieved a "depth", and here the nullmove call the search with
>>depth-3 so three plies less will be played right? I 'm not understanding what
>>that depth variable means or what a r=3 or r=2 means for you all?
>>
>>thx.
>
>R is the Null Move Depth Reduction. For the normal search you reduce the
>remaining depth by one ply the deeper you go into the tree.
>So for the Nullmove
>
>nullscore = -search(-beta, -beta+1, depth -R -1, 1);
>
>Therefore his extra reduction is 2.
>
>Georg

wow...... thanks..... amazing :)

I suspected that before only by a post of Vincent before, that said something
like if there is 5 plies remaining, with r=3, only one ply will be played by the
other side. That's true anyway. A little ambiguous for me :)

so I'm using r=2. Thanks for the info :)
I do have tried r=3, it didn't look better.

thanx again. doh.

Anyway the REAL reduction is 3 there. I don't get the sense of the oficial
definition.



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