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Subject: Re: Crafty-IsiChess,CCT4,r11 ==> A move to avoid?

Author: Roy Eassa

Date: 13:43:28 01/29/02

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On January 29, 2002 at 16:36:23, Thomas Mayer wrote:

>Hi Roy,
>
>>>Wow, Fritz 7b is blind to this one.  It does not see in advance that 37...Nxe5
>>>is good for Black (it thinks Black is down more than 3 pawns).  Must be
>>>null-move / zugzwang, right?
>>
>>
>>To be more specific, in the following position Black can play ...Re6 and be in
>>very good shape (certainly not behind).  However, Fritz 7b evaluates this
>>position as being better for White by about 5 pawns:
>>
>>[d] 8/8/1p1r1k2/p1pRN1p1/P3K1P1/1P6/8/8 b - - 0 2
>
>strange... Quark fully disagrees and thinks that black is little bit better...


Quark is right.  Fritz is wrong.

I guess this is a very good example of a blindness caused by using null move.

My question is, do all zugzwang positions confound null move, or only some?



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