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Subject: Re: Weakness in Rybka ending

Author: Tobias Lagemann

Date: 15:02:20 01/21/06

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Hello Bigler,

On January 21, 2006 at 16:18:58, Bigler wrote:

>Hi folks,
>
>Yes, we know, still missing endgame knowledge.
>
>[Event "Partie évaluée, 5m + 0s"]
>[Site "Salle des machines"]
>[Date "2006.01.20"]
>[Round "?"]
>[White "Twister again, Rybka 1.01 Beta 11 "]
>[Black "Lasker#77, Rybka 1.01 Beta 11 "]
>[Result "1-0"]
>[ECO "E16"]
>[WhiteElo "2615"]
>[BlackElo "2744"]
>[PlyCount "57"]
>[EventDate "2006.01.16"]
>
>1. c4 Nf6 2. d4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7 5. g3 b6 6. Bg2 Bb7 7. O-O Bxd2 8.
>Qxd2 d6 9. Nc3 Ne4 10. Nxe4 Bxe4 11. Qf4 f5 12. Ng5 Bxg2 13. Kxg2 O-O {(h6)}
>14. d5 e5 {(exd5)} 15. Qh4 h6 16. Ne6 Rf6 17. f4 e4 {(exf4)} 18. Qh5 Nd7 {(Dd7)
>} 19. g4 fxg4 20. Qxg4 Nc5 {(g6)} 21. f5 Nxe6 {(Te8)} 22. fxe6 Raf8 23. Kg1
>Rxf1+ 24. Rxf1 Rxf1+ 25. Kxf1 Qf6+ 26. Kg2 Qxb2 27. Qxe4 Qf6 28. Qf3 Qxf3+ (
>28... Qg5+ {(Dxf3+)} 29. Kh3 h5 30. e3 g6 31. Qf7+ Kh8 32. Qf4 Qxf4 33. exf4
>Kg7 34. Kh4 Kf6 35. f5 gxf5 36. Kxh5 a6 37. h4 {
>Lasker#77,Rybka 1.01 Beta 11 3 abandonne}) 29. exf3 1-0
>
>[D]6k1/p1p3p1/1p1pP2p/3P4/2P5/5P2/P5KP/8 b - - 0 29
>
>Rybka doesnt see clearly that after a Qeen trade the final is hopeless
>
>regards to all.

not only weekness in Rybkas ending... ;-)

Kind regards
Tobias


6k1/p1p3p1/1p1pPq1p/3P4/2P5/5Q2/P3P1KP/8 b - - 0 1

Analysis by Fritz for Fun 4 (this ist Fritz 8):

28...De7 29.e4 g6 30.De3 Dh4 31.h3 a6
  ±  (1.05)   Tiefe: 7/16   00:00:00  43kN
28...Kf8!
  ±  (1.05)   Tiefe: 7/19   00:00:00  57kN
28...Kf8 29.Dxf6+ gxf6 30.e4 Ke7 31.Kf3 c6 32.Kf4 cxd5
  ±  (0.95)   Tiefe: 7/19   00:00:00  60kN
28...Kf8!
  ²  (0.67)   Tiefe: 8/16   00:00:00  84kN
28...Kf8--
  ±  (0.95)   Tiefe: 9/16   00:00:00  119kN
28...Kf8 29.Dxf6+ gxf6 30.Kf3 Kg7 31.Kg4 Kg6 32.e4 h5+ 33.Kh4 a6 34.a3
  +-  (2.22)   Tiefe: 9/24   00:00:00  186kN
28...De7!
  +-  (2.21)   Tiefe: 9/24   00:00:00  199kN
28...De7!
  +-  (2.05)   Tiefe: 9/24   00:00:00  201kN
28...De7!
  +-  (1.74)   Tiefe: 9/24   00:00:00  205kN
28...De7!
  ±  (1.11)   Tiefe: 9/24   00:00:00  220kN
28...De7 29.e4 g6 30.De3
  ±  (1.08)   Tiefe: 9/24   00:00:00  241kN
28...Dxf3+!
  ±  (1.08)   Tiefe: 9/24   00:00:00  456kN
28...Dxf3+!
  ±  (0.92)   Tiefe: 9/24   00:00:00  463kN
28...Dxf3+ 29.exf3 g6 30.f4 Kf8 31.Kf3 Ke7 32.Ke4 c6 33.a3 cxd5+
  ±  (0.86)   Tiefe: 9/24   00:00:00  489kN
28...Dxf3+!
  ²  (0.58)   Tiefe: 10/19   00:00:01  586kN
28...Dxf3+ 29.exf3 g6 30.Kf2 Kf8 31.f4 Ke7 32.Ke3 c6
  ²  (0.57)   Tiefe: 11/23   00:00:02  998kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke3 c6 33.Ke4 Ke7 34.a3 a6 35.h3
  ²  (0.48)   Tiefe: 12/23   00:00:04  1790kN
28...Dxf3+ 29.exf3 Kf8 30.f4 g6 31.Kf3 Ke7 32.Ke3 c6 33.Ke4 Kf6 34.Kd4
  ²  (0.41)   Tiefe: 13/24   00:00:07  3773kN
28...Dxf3+ 29.exf3 Kf8 30.f4 g6 31.Kf3 Ke7 32.Ke3 c6 33.Ke4 a6 34.h3 cxd5+
35.Kxd5 b5
  ²  (0.59)   Tiefe: 14/29   00:00:15  7804kN
28...Dxf3+--
  ±  (0.87)   Tiefe: 15/33   00:00:33  18232kN
28...Dxf3+ 29.exf3 g6
  ±  (0.87)   Tiefe: 15/46   00:00:42  23693kN
28...Dxf3+ 29.exf3 g6 30.h4 Kg7 31.h5 Kf6 32.hxg6 Kxg6 33.f4 Kf6 34.f5 a6
  ±  (0.75)   Tiefe: 16/36   00:01:25  48969kN
28...Dxf3+--
  ±  (1.03)   Tiefe: 17/37   00:02:25  84565kN
28...Dxf3+ 29.exf3 g6
  ±  (1.03)   Tiefe: 17/66   00:12:46  604205kN



Analysis by 3D-Schach 5.0 (this is Chesstiger 15):

28...Kf8 29.Dxf6+ gxf6
  +-  (1.46)   Tiefe: 1   00:00:00
28...Kf8 29.Dxf6+ gxf6
  +-  (1.46)   Tiefe: 1   00:00:00
28...Kf8 29.Dxf6+ gxf6 30.Kf3
  +-  (1.52)   Tiefe: 2   00:00:00
28...Dxf3+ 29.Kxf3 Kf8 30.Ke4
  +-  (1.50)   Tiefe: 2   00:00:00
28...Dxf3+ 29.Kxf3 Kf8 30.Ke4 Ke7
  +-  (1.50)   Tiefe: 3   00:00:00
28...Dxf3+ 29.Kxf3 Kf8 30.Ke4 g6 31.h4
  +-  (1.48)   Tiefe: 4   00:00:00
28...Dxf3+ 29.Kxf3 Kf8 30.Ke4 g6 31.h4 Ke7
  +-  (1.48)   Tiefe: 5   00:00:00  1kN
28...Dxf3+ 29.Kxf3 Kf8 30.Kf4 g6 31.e4 g5+ 32.Kf5 Ke7
  +-  (1.58)   Tiefe: 6   00:00:00  4kN
28...Dxf3+ 29.Kxf3 Kf8 30.Kf4 Ke7 31.Kf5 a6 32.h4 a5
  +-  (1.68)   Tiefe: 7   00:00:00  13kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.a4
  +-  (1.50)   Tiefe: 8   00:00:00  54kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.a4 a5
  +-  (1.50)   Tiefe: 9   00:00:00  70kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.a4 a5 34.Kd4
  +-  (1.54)   Tiefe: 10   00:00:00  117kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.h4 c6 34.a3 h5
  +-  (1.50)   Tiefe: 11   00:00:00  182kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.a4 c6 34.h4 cxd5+
35.cxd5 b5 36.axb5 axb5
  +-  (1.42)   Tiefe: 12   00:00:00  286kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.a4 c6 34.h4 cxd5+
35.cxd5 b5 36.axb5 axb5
  +-  (1.42)   Tiefe: 13   00:00:01  421kN
28...Dxf3+ 29.exf3 g6 30.f4 Kg7 31.Kf3 Kf6 32.Ke4 a6 33.a4 c6 34.h4 cxd5+
35.cxd5 b5 36.axb5 axb5
  +-  (1.42)   Tiefe: 14   00:00:01  818kN
28...Dxf3+ 29.exf3 g6 30.Kf2 Kg7 31.Ke3 Kf6 32.h4 a6 33.a4 c6 34.Kd4 cxd5
35.cxd5 b5
  +-  (1.42)   Tiefe: 15   00:00:09  4125kN
28...Dxf3+ 29.exf3 g6 30.Kf2 Kg7 31.h4 Kf6 32.f4 Ke7 33.Ke3 Kf6 34.Ke4 c6 35.a4
cxd5+ 36.cxd5 a6 37.Kd4 b5 38.axb5
  +-  (1.44)   Tiefe: 16   00:00:15  7014kN
28...Dxf3+ 29.exf3 g6 30.Kf2 Kg7 31.h4 Kf6 32.f4 Ke7 33.Ke3 Kf6 34.Ke4 c6 35.a4
cxd5+ 36.cxd5 a6 37.Kd4 b5 38.axb5
  +-  (1.44)   Tiefe: 17   00:00:37  16991kN
28...Dxf3+ 29.exf3 g6 30.Kf2 Kg7 31.h4 Kf6 32.f4 Ke7 33.Ke3 Kf6 34.Ke4 a6 35.a4
c6 36.dxc6 Kxe6 37.h5 gxh5 38.f5+
  +-  (1.44)   Tiefe: 18   00:02:18  62782kN
28...Dxf3+ 29.exf3 g6 30.Kg3 Kg7 31.Kg4 Kf6 32.f4 a6 33.a4 c6 34.dxc6 Kxe6 35.h3
Ke7 36.h4 d5 37.cxd5 b5 38.c7
  +-  (1.48)   Tiefe: 19   00:03:10  87110kN



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