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

Author: Uri Blass

Date: 12:02:20 10/18/05

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On October 18, 2005 at 14:49:41, chandler yergin wrote:

>On October 18, 2005 at 12:11:56, Drexel,Michael wrote:
>
>>[D]1n1r3k/1p1n4/2p5/8/3B4/8/4K3/R7 b - - 0 1
>>
>>Analysis by Fritz 9:
>>
>>5...Se5 6.Lc3 b5 7.Ta7 Kg8 8.Tc7 Te8
>>  ³  (-0.34)   Depth: 7/19   00:00:00  72kN
>>5...Se5 6.Lc3 b5 7.Ta8 Kh7 8.Ta5 Sd3 9.Ke3
>>  ³  (-0.37)   Depth: 8/19   00:00:00  169kN
>>5...Se5 6.Lc5 b5 7.Le7 Te8 8.Lf6+ Kh7 9.Kd2 Sbd7 10.Th1+ Kg6
>>  ³  (-0.38)   Depth: 9/28   00:00:00  490kN
>>5...Se5 6.Lc3 b5 7.Tb1 Kh7 8.La1 Sa6 9.Lc3 Kg6 10.Th1
>>  ³  (-0.38)   Depth: 10/26   00:00:00  1234kN
>>5...Se5 6.Lc3 b5 7.Ta7 Sa6 8.Kf1 c5 9.Ke2 Kg8 10.Tb7 Sc7
>>  ³  (-0.38)   Depth: 11/29   00:00:01  2285kN
>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Td3 9.La1 Sbd7 10.Tb4 Kf7 11.Lb2
>>  ³  (-0.40)   Depth: 12/30   00:00:04  6291kN
>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Kf7 9.La5 Td3 10.Lc7 Sbd7 11.Tb4 Kg6
>>  ³  (-0.41)   Depth: 13/40   00:00:11  15607kN
>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Kf7 9.Tf1+ Ke6
>>  ³  (-0.43)   Depth: 14/38   00:00:30  42044kN
>>5...Se5 6.Lc3 b5 7.Th1+ Kg8 8.Tb1 Kf7 9.Tf1+ Ke6
>>  ³  (-0.43)   Depth: 14/46   00:01:27  121127kN
>>
>>This is not supposed to be the Giveaway chess engine :)
>
>It's not, and it's not a Bug.
>Right click in your analysis window, you will get a menu
>One of the selections is 'scroll main line'
>If this is checkmarked you will get what you posted.
>Click on 'scroll main line again', this deactivates it, and you will see the
>normal PV Analysis.

The problem is that Fritz9 choose Ne5 that is a stupid move that gives a piece
for nothing and I do not see what it has to do with scroll main line.

It seems that it has a bug in evaluating some positions when one side is piece
and 2 pawns down and it evaluate them as close to draw.

Uri



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