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Subject: Re: Huge Bug in Fritz 9 (Engine)

Author: George Tsavdaris

Date: 09:37:47 10/18/05

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On October 18, 2005 at 12:11:56, Drexel,Michael wrote:

>[D]1n1r3k/1p1n4/2p5/8/3B4/8/4K3/R7 b - - 0 1
>This is not supposed to be the Giveaway chess engine :)
>
>The endless number of Bugs in the GUI are not worth mentioning of course.

Good discovery! The bug seems to be deeper i suspect, since Fritz 8 (i haven't
analysed with 9 because i don't have it) evaluates black's position as slightly
better -actually as almost drawish) even after Kg8 or Kh7.

 So i suspect Fritz 9 would evaluate Kg8 or Kh7 as around 0.38 so it plays Ne5
as this looks to Fritz as drawish too. That means it doesn't understand the
position. What if you force the moves 1...Kh7 2.Rh1+ Kg6 3.Rg1+ Kf7 4.Rf1+ Ke6
+-
Does Fritz 9 shows now a big advantage for black? If my suspicions are correct
and with a comparison with F8 evaluation, i believe that even in this position
that occured, Fritz 9 will believe that it is still a draw.

 So now Frans Morsch has to try to understand what is the "problem" behind this
position, because as such position exists, there may be (many) others with the
same bad behaviour for Fritz 9 and this is the actual problem.....

After 1...Kh7 2.Rh1+ Kg6 3.Rg1+ Kf7 4.Rf1+ Ke6 +-
[D]1n1r4/1p1n4/2p1k3/8/3B4/8/4K3/5R2 w - - 0 5

>
>Michael



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