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Subject: Re: Rybka bug or weakness

Author: Vincent Lejeune

Date: 04:44:13 12/05/05

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On December 05, 2005 at 07:22:40, Kurt Utzinger wrote:

>On December 05, 2005 at 06:36:35, Vincent Lejeune wrote:
>
>>[d]8/4k3/2R5/4p3/4B1K1/5P2/1r6/8 w - - 0 73
>>Here Rybka played Kg3?, why not Kf5 to pick up the pawn ?
>>I suppose it's a bug...
>
>
>      I don't see the problem. On my P4 1.8/32 MB hash
>      Rybka plays Kf5
>      Regards
>      Kurt
>
>New game - AnMon5.40,
>8/4k3/2R5/4p3/4B1K1/5P2/1r6/8 w - - 0 1
>
>Analysis by Rybka 1.0 Beta 32-bit:
>
>73.Kf5
>  +-  (5.37)   Depth: 3   00:00:00
>73.Bd5
>  +-  (5.44)   Depth: 3   00:00:00
>  +-  (5.07)   Depth: 4   00:00:00
>73.Kf5 Rb8 74.Re6+ Kd7 75.Rg6 Ke7 76.Kg4 Rd8 77.Kg3 Rd6
>  +-  (5.40)   Depth: 4   00:00:00
>  +-  (5.05)   Depth: 13   00:00:04  526kN
>73.Rc7+ Kd6 74.Rc1 Rg2+ 75.Kf5 Rg8 76.Kf6 Rf8+ 77.Kg7 Ke7
>  +-  (5.06)   Depth: 13   00:00:13  1524kN
>  +-  (5.05)   Depth: 15   00:00:20  2553kN
>73.Kf5 Rb8 74.Re6+ Kd7 75.Rg6 Ke7 76.Kg4 Rd8 77.Kg3 Rd2
>  +-  (5.06)   Depth: 15   00:00:23  2927kN
>  +-  (5.06)   Depth: 18   00:01:10  9622kN
>
>(Utzinger,  05.12.2005)

I see that Rybka 1.0 have trouble to win this position when it have 20 sec to
finish the game, probably a problem from 1) time management + 2) not
"understand" Kf5 is winning in very early depth !




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