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

Author: chandler yergin

Date: 22:52:54 10/18/05

Go up one level in this thread


On October 19, 2005 at 01:25:28, Uri Blass wrote:

>On October 19, 2005 at 01:22:08, chandler yergin wrote:
>
>>On October 19, 2005 at 01:03:11, chandler yergin wrote:
>>
>>>On October 18, 2005 at 18:37:24, Robert Hyatt wrote:
>>>
>>>>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.
>>
>>
>>New game
>>[D]1n1r3k/1p1n4/2p5/8/3B4/8/4K3/R7 b - - 0 1
>>
>>Analysis by Fritz 5.32:
>>
>>1. -+ (-4.69): 1...Kg8 2.Rh1 Re8+ 3.Kd3 Ne5+ 4.Bxe5 Rxe5 5.Ra1 Rd5+ 6.Kc2
>>2. -+ (-4.63): 1...Kh7 2.Rh1+ Kg6 3.Rh8 Nf8 4.Bb6 Re8+ 5.Kd3 Nbd7 6.Bc7
>>3. µ (-0.97): 1...Ne5 2.Bxe5+ Kg8 3.Ra8 Re8 4.Kd3 Rxe5 5.Rxb8+ Kf7 6.Rxb7+
>>
>>(, MyTown 18.10.2005)
>
>This only proves that Fritz5.32 does not have the bug.

All the Fritz engines work the same way.. Shredder included.

>The bug is specific for Fritz9 engine that fails to evaluate Kg8 or Kh7 as -+

You have a 'user' that has a complaint, out of how many millions that use
this product?

>
>Uri
        The Fritz9 Engines per se.. do not have this bug. I explained how
and what this problem is. Also how to correct it.



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