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

Author: chandler yergin

Date: 12:09:40 10/18/05

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On October 18, 2005 at 15:02:20, Uri Blass wrote:

>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.

Please do as I have noted, and then Post result.
With Scroll activated, it continues to scroll the main PV and is not overwritten
with better lines. If the main PV selected at the time,
was Se5, it will continue to scroll that in depth.

>
>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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