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Subject: Re: So is this a BUG in Fritz 7b?

Author: Uri Blass

Date: 12:19:16 01/31/02

Go up one level in this thread

On January 31, 2002 at 12:41:11, Roy Eassa wrote:

>On January 30, 2002 at 18:52:06, Vincent Lejeune wrote:
>>On January 30, 2002 at 18:07:38, Chessfun wrote:
>>>On January 30, 2002 at 17:18:21, Roy Eassa wrote:
>>>>On January 29, 2002 at 16:13:45, Roy Eassa wrote:
>>>>>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
>>>>Re: So is this a BUG in Fritz 7b -- something that should be fixed?  Something
>>>>that could easily be fixed without negatively impacting anything else to any
>>>>measurable degree?
>>>Not just Fritz 7b, infact most Fritz versions see white clearly winning.
>>Yes, simply because :
>>1)white is in zugzwang
>>2)Fritz use null-move
>>and both are not compatible with each other.
>But other programmers' engines use null move and they do NOT have the same
>problem with this position (due to refinements in their null move handling, as I
>understand it).
>Thus this is essentially a Fritz BUG that can be fixed, thereby making Fritz
>stronger (IMO).

No it is not.
It is a design decision of the Fritz programmers to use slightly different null
move algorithm.

many of the other programs also blunder before this move and Crafty blundered in
the game because of it's null move algorithm.


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