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Subject: Re: Null-Move: Difference between R = 2 and R = 3 in action

Author: Gian-Carlo Pascutto

Date: 13:09:57 07/15/02

Go up one level in this thread


On July 15, 2002 at 16:00:52, Dann Corbit wrote:

>On July 15, 2002 at 13:30:54, Gian-Carlo Pascutto wrote:
>
>>On July 15, 2002 at 13:11:09, Christophe Theron wrote:
>>
>>>Why does double null move prove that null move is a correct search method????
>>>
>>>Doing two null moves in a row means going back to standard search (a search not
>>>involving an illegal move like null move is).
>>>
>>>I fail to see how it legitimates null move.
>>
>>I think the idea is simply to show that you can nullmove and still
>>have a correct search. (but only with double nullmove, not single)
>
>Here is how to use double null move:
>
>Use your regular null move every place you are using it now (unless you use it
>with in check or when zugzwang).

Have a foolproof method for identiefying zugzwang?

>When something occurs where you would normally abandon null move, switch to
>double null move instead.
>
>In other words, we will never give it up completely, but (instead) switch to
>double null move when things get dicey.
>
>For sure, it is much better than abandoning it altogether, unless you know for
>sure it should not be used at all in some particular situation.
>
>E.g.:
>Pieces get thin (pass below some threshold in points) --> instead of turning
>null move off, switch to double null move.

I do something similar, except that I use a verification search instead
of double-nullmove, and I never use it in pawn endings.

--
GCP



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