Author: Dieter Buerssner
Date: 05:00:54 02/05/06
Go up one level in this thread
On February 04, 2006 at 10:40:01, Vincent Lejeune wrote:
>I suppose Rybka (black) play the blunder 67...Kd4 ?and throw away the win, I
>suppose it didn't have EGTB's.
Black still had a forced win later. Yace after some backwards analysis at move
69 of black:
[d] 7r/3P1P2/4K3/b3P2P/3k4/8/8/8 b - -
11/27 0:01 +M28 69...Tf8 70.Ke7 Ta8 71.Kd6 Lb4+
72.Ke6 Ld2 73.Kf6 Kd5 74.Kf5 Lc3 (1.170.028) 850 TB:105
The mate will most probably be shorter.
And here the search tree I used for the backwards analysis:
[Event "?"]
[Site "?"]
[Date "2006.02.05"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1
b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7
12. Nbd2 cxd4 13. cxd4 Nc6 14. Nb3 a5 15. Be3 a4 16. Nbd2
Rd8 17. Bd3 Bd7 18. Qe2 Qb7 19. Rac1 Rac8 20. a3 g6 21. b4
axb3 22. Nxb3 Qa8 23. Ra1 d5 24. exd5 e4 25. dxc6 exf3
26. Qxf3 Bxc6 27. Qg3 Qa4 28. Nd2 Nd5 29. Nf3 Nxe3 30. fxe3
Qb3 31. Bf5 Bd6 32. Qg5 h6 33. Qg4 Bxf3 34. gxf3 Rc3
35. Rab1 Qa2 36. f4 Qd5 37. Bxg6 fxg6 38. Qxg6+ Kf8
39. Qxh6+ Ke8 40. Qg5 Be7 41. Qg6+ Kd7 42. Qg4+ Kc7
43. Rbc1 Rxc1 44. Rxc1+ Kb7 45. Rb1 Kb6 46. a4 b4 47. Qe2
Rh8 48. Kh2 Qf5 49. Qb5+ Qxb5 50. axb5 Kxb5 51. e4 Kc4
52. d5 b3 53. e5 Kc3 54. d6 Bh4 55. Kg2 Kc2 56. Rf1 b2
57. Kf3 b1=Q 58. Rxb1 Kxb1 59. Ke4 Be1 60. f5 Bb4 61. Kd5
Rh5 62. d7 Ba5 63. f6 Bd8 64. Ke6 Kc2 65. f7 Rh8 66. Kd6
Kd3 67. h4 Kd4 68. h5 Ba5 69. Ke6 Ke4 (69... Rf8 70. Ke7
(70. h6 Bd8 71. h7 (71. Kf5 Kd5 72. h7 Be7) 71... Ke4
72. Kd6 Kf5 73. e6 Kf6 {M17}) (70. Kf6 Bd8+ 71. Ke6 Ke4)
(70. d8=Q+ Bxd8) 70... Ra8 71. Kf6 (71. Ke6 Bd2 72. Kf6
(72. Kd6 Ke4 73. Ke6 (73. e6 Bb4+) (73. f8=Q Rxf8) (73. h6
Bb4+) 73... Ra6+ 74. Ke7 Bg5+ 75. Kf8 Ra8+ 76. Kg7 Be7)
(72. Kf5 Kd5) (72. h6 Bxh6) 72... Kd5) (71. Kd6 Bb4+)
71... Kd5 72. Kg7 (72. h6 Bd8+ 73. Kg7 (73. Kg6 Bh4)
73... Be7) 72... Bb4 73. Kf6 Kc6 74. e6 (74. Ke6 Kc7
75. d8=Q+ (75. h6 Rh8 {M18}) (75. Kf5 Kxd7 {M19})
75... Kxd8) (74. d8=Q Rxd8 75. Kf5 (75. h6 Kd7 {M17})
75... Rh8 76. h6 Rxh6 {M13}) 74... Kd6 75. h6 Bc3+ {M17 or
better}) 70. Kf6 Bc3 71. h6 Ra8 72. h7 Bb2 73. Ke7 Ba3+
74. Kf6 Bb2 75. Ke7 Ba3+ 76. Kf6 Bb2 {Game drawn by
repetition} *
Regrads,
Dieter
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