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

Author: Robert Hyatt

Date: 15:37:24 10/18/05

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On October 18, 2005 at 16:15:01, chandler yergin wrote:

>On October 18, 2005 at 15:44:02, Uri Blass wrote:
>
>>On October 18, 2005 at 15:09:40, chandler yergin wrote:
>>
>>>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.
>>
>>I do not have Fritz9 so I cannot do it but I expect every good program to never
>>choose that move(except maybe first iteration when it still did not look at all
>>legal moves) but Fritz does not show first iteration information.
>>
>>Uri
>  Of course no good probram or bad program would choose that move.
>Ne5 is 4th choice. Only if that was the PV the engine was lookng at when the
>time allocation software made it move.

Search doesn't work like that.  Search plays the _best_ move found so far when
the time runs out, not the move it is currently looking at...



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