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Subject: Re: engine repetition bug?!

Author: Günter Müller

Date: 03:51:17 09/10/01

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On September 10, 2001 at 02:42:38, Uri Blass wrote:

>On September 09, 2001 at 18:23:08, Günter Müller wrote:
>
>>On September 09, 2001 at 17:42:03, Günter Müller wrote:
>>
>>>On September 09, 2001 at 13:50:25, Torstein Hall wrote:
>>>
>>>>On September 09, 2001 at 13:10:25, Uri Blass wrote:
>>>>
>>>>>On September 09, 2001 at 12:26:35, Torstein Hall wrote:
>>>>>
>>>>>>After the following moves we reach this position:
>>>>>>
>>>>>>
>>>>>>Kasparov,G (2851) - Shirov,A (2751) [C11]
>>>>>>Fujitsu-Siemens Giants Frankfurt GER (3), 23.06.2000
>>>>>>[Fritz 6 (180s)]
>>>>>>
>>>>>>C11: French: Classical System: 4 e5 and 4 Bg5 dxe4
>>>>>> 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4 5.Nxe4 Nbd7 6.Nf3 Be7 7.Nxf6+ Bxf6 8.h4
>>>>>>0-0 9.Bd3 c5 10.Qe2 cxd4 11.Qe4 g6 12.0-0-0 Qa5 13.Bxf6 Nxf6 14.Qxd4 Nh5 15.a3
>>>>>>Rd8 16.Qe3 Bd7 17.g4 Nf6 18.Qf4 Nd5 19.Qh6 Nf6 20.Ng5 Bc6 21.Bxg6 hxg6 22.Nxe6
>>>>>>fxe6 23.Qxg6+ Kh8 24.Qxf6+ Kh7 25.Rhe1 Rxd1+ 26.Rxd1 Qc5 27.g5+- Rf8 28.Qh6+ Kg8
>>>>>>29.Qxe6+ Kg7 30.Qh6+ Kg8 31.Qg6+ Kh8 32.Qh6+ Kg8
>>>>>>
>>>>>>[D]5rk1/pp6/2b4Q/2q3P1/7P/P7/1PP2P2/2KR4 w - - 0 33
>>>>>>
>>>>>>When Fritz has the gamescore it wants to play 33.Rd6 whish probably wins, but
>>>>>>takes a lot longer. If the game score is not given to Fritz it want to play
>>>>>>33.Qe6+ like Kasparov did. This must be a repetition bug?!
>>>
>>>>Torstein
>>>
>>>Hi
>>>This is  bug.Only two time repetition we have hat.
>>>When Fritz has the gamescore it wants to play 33.Rd6 and you give 33.Qe6+ by
>>>manuell input the answer is a mistake!
>>>
>>>5rk1/pp6/2b1Q3/2q3P1/7P/P7/1PP2P2/2KR4 b - - 0 1
>>>
>>>Analysis by Fritz 6:
>>>
>>>1. = (0.00): 33...Kg7 ???
>>>2. +- (1.84): 33...Kh8 34.Kb1 Ba4 35.Rd2 Qc6
>>>3. +- (7.91): 33...Kh7 34.Rd6 Be8 35.g6+ Kg7 36.Qe7+ Bf7 37.Qf6+ Kg8 38.gxf7+
>>>4. +- (9.56): 33...Rf7 34.Rd8+ Qf8 35.g6 Kg7 36.Rxf8 Rxf8 37.Qe7+
>>>
>>>The next move is normal
>>>
>>>5r2/pp4k1/2b1Q3/2q3P1/7P/P7/1PP2P2/2KR4 w - - 0 1
>>>
>>>Analysis by Fritz 6:
>>>
>>>34.Rd6 Rxf2 35.Qe7+ Rf7 36.Rg6+ Kxg6 37.Qxc5 Rf4 38.Qd6+ Kf5
>>>  +-  (4.59)   Depth: 1/6   00:00:00
>>>  +-  (4.72)   Depth: 12/30   00:00:05  3007kN
>>>
>>>(, home 09.09.2001)
>>>MfG
>>>Günter
>>The bug is in Chessbase-GUI with Fritz Shredder Hiarcs Nimzo Tiger , but not
>>with Crafty 18.10.
>>MfG
>>Günter
>
>It is not a bug
>It is a design decision
>
>It is easy to correct the problem by deciding that repetition of previous
>position in the game is not a draw unless they happened twice but in this case
>Deep Fritz's level in comp-comp games is probably going to be demaged because
>repetition in comp-comp games is usually not the best move if the position is
>not a draw and Fritz is going to waste time about more unimportant lines.
>
>Uri
Thank you i agree.Under S5-GUI is the same with Shredder5.
Günter



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