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Subject: Re: negative extensions

Author: Ed Schröder

Date: 10:15:59 01/25/01

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On January 25, 2001 at 12:27:29, Gian-Carlo Pascutto wrote:

>On January 25, 2001 at 12:20:46, Miguel A. Ballicora wrote:
>
>>Doesn't the classic null-move approach just cut a branch rather than
>>lowering the depth?
>
>Yep...That's also what Robert, Ed and Vincent are doing.

I don't use null-move myself.


>>Of course, cutting a branch is a particular case of reducing the
>>depth (the extreme case). I am asking because I think that I am doing
>>something different...
>
>I think you are the only one so far who really understood what
>I meant ;)

The goal of null-move is to lower the (current) depth with X-plies, in
CC terms called R=X. Most common is R=2. "R" stands for reduce.

Of course you don't have to do a null-move to practise a R=2. In Rebel
I do R=1, R=2 and complete razoring (R=INFINITE) based on eval and some
special code not to prune / reduce important parts of the tree.

Whatever you choose all cases are good for a few years of headaches :)

Ed



>--
>GCP



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