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Subject: Re: Rybka bug or weakness

Author: Kurt Utzinger

Date: 04:22:40 12/05/05

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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)



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