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Subject: Re: When to do a null move search - an experiment

Author: Uri Blass

Date: 05:36:10 04/29/04

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On April 29, 2004 at 08:24:54, Sune Fischer wrote:

>On April 29, 2004 at 08:10:03, Vincent Diepeveen wrote:
>
>>On April 28, 2004 at 18:31:48, Sune Fischer wrote:
>>
>>>
>>>>double nullmove:
>>>>
>>>>allowed: a3 null null d5 ...
>>>>allowed: a3 null null d5 null null d4 ....
>>>>allowed: a3 null d4 null null d5 ...
>>>>etc.
>>>
>>>I gues the last one should have been
>>>
>>>allowed: a3 null d4 null d5 ...
>>
>>That will not find zugzwangs.
>>
>>if there is a zugzwang after a3 null d4, then doing a double null after that
>>will find it. i am interested in seeing zugzwangs with nullmove. with just 1
>>rule into my nullmove i can find them without big problems.
>
>Hmm, I don't see how you will catch zugzwangs after 3 nullmoves.

Not after 3 null move but after 2 null moves.

Imagine the following game
Every side can avoid moving but not 2 moves in a row.
Assume also that not moving does not change the 50 move counter.

The result is the same result as normal game because not moving in case of
zugzwang only delay the loss(the opponent can reply by not moving).

If you start to search every ply with null with reduced depth then you detect
zugzwangs if you search deep enough.

Uri



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