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

Author: Dann Corbit

Date: 14:05:45 07/15/02

Go up one level in this thread

On July 15, 2002 at 17:02:42, Dann Corbit wrote:

>On July 15, 2002 at 16:43:39, Gian-Carlo Pascutto wrote:
>>On July 15, 2002 at 16:19:32, Dann Corbit wrote:
>>>On July 15, 2002 at 16:09:57, Gian-Carlo Pascutto wrote:
>>>>Have a foolproof method for identiefying zugzwang?
>>>Never bother analyzing the root node.  Analyze all forward nodes from the root
>>>instead at ply zero [from current].
>>>If every evaluation is worse than the current evaluation before analysis, then
>>>you are zugzwang.
>>>It's also handy for move ordering.
>>This doesn't work :)
>>(Explanation left as exercise to the reader)
>It leaves false positives.  It also assumes an exhaustive ply 0 search (eval).

Can you show a case where you are zugzwang and one of the forward moves looks
better for the side to move?

At any rate, it is a simple place to turn on double null move instead of regular
null move.

In the case of a fail low for the current position, it's a good idea to widen
the search anyway.

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