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Subject: Re: Avoid move Nxf3 test position

Author: Robert Hyatt

Date: 19:28:57 12/27/00

On December 27, 2000 at 21:03:54, Howard Exner wrote:

>An engine vs engine game with an interesting endgame.
>
>[Event "Century3 engine vs engine on one computer"]
>[Site "game 1, 15 minutes per game, Atlon900 Mhz."]
>[Date "2000.12.27"]
>[Round "?"]
>[White "Rebel Century 3"]
>[Black "ck24041.eng"]
>[Result "*"]
>[WhiteElo "2740"]
>[BlackElo "2740"]
>[ECO "C88"]
>
>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 Bb7 10. d4 Na5 11. Bc2 c5 12. a4 Qc7 13. axb5 axb5 14.
>Na3 exd4 15. Nxb5 Qd7 16. Na3 dxc3 17. bxc3 Nc4 18. Qe2 Nxa3 19. Bxa3 Rfe8
>20. Nd2 Bd8 21. Qd3 Ba6 22. Qe3 Bb7 23. Bb2 Rxa1 24. Rxa1 Qe7 25. Ba4 Rf8
>26. Re1 Ba5 27. Nc4 Bc7 28. f3 Ba6 29. Nxd6 Bxd6 30. e5 Rb8 31. exd6 Qxe3+
>32. Rxe3 Rxb2 33. Re7 Rb8 34. Rc7 Rd8 35. Rc6 Bb7 36. Rc7 Bd5 37. Rxc5
>Kf8 38. c4 Be6 39. Rc6 Bd7 40. Ra6 Bxa4 41. Rxa4 Rxd6 42. Kf2 Rd2+ 43.
>Kg1 Rc2 44. Rb4 Ne8 45. Ra4 Nd6 46. c5 Rxc5 47. Ra2 Ke7 48. g4 g5 49. Kf2
>Ke6 50. Kg3 Rc3 51. Ra6 Rb3 52. Kf2 Kd5 53. Ra7 Rb7 54. Ra5+ Rb5 55. Ra8
>Rb2+ 56. Kg3 Rb3 57. Ra5+ Kd4 58. Kf2 Rb5 59. Ra7 Rb7 60. Ra5 h6 61. Ra6
>Kd5 62. Kg3 Rb3 63. Kf2 Kc5 64. Ra7 Kd4 65. Ra6 Ke5 66. Ra5+ Rb5 67. Ra2
>f5 68. Re2+ Kf6 69. gxf5 Nxf5 70. Ra2 h5 71. Rd2 Rb3 72. Rd8 Nh4 73. Ke2
>Ng6 74. Rd6+ Kf7 75. Kf2 Nf4 76. h4 Rb2+ 77. Kf1 gxh4 78. Rd4 Ng6 79. Re4
>h3 80. Kg1 Kf6 81. Kh1 Ne5 82. Rf4+ Kg6 83. Rf8 Rf2 84. Kg1 h2+ 85. Kh1
>h4 86. Ra8 Nxf3 87. Ra6+ Kg5 88. Ra5+ Kg4 89. Rg5+ Kf4 90. Rf5+ Ke3 *
>
>This position is after 86. Ra8. Black should avoid Nxf3 because of perpetual
>check or stalemate. Rxf3 should win. Any programs avoid the move Nxf3?
>
>[D]R7/8/6k1/4n3/7p/5P2/5r1p/7K b - -


Strange.  I tried this and I _never_ get Nxf3 at all. I get h3 at early
plies, then Kf6, until it changes to Kf5 for good...  Interesting problem
of course.  And I have seen this happen to both crafty and its opponents
from time to time...

Re: Avoid move Nxf3 test position Howard Exner 15:40:30 12/28/00
- Re: Avoid move Nxf3 test position Robert Hyatt 18:45:46 12/28/00
  - Re: Avoid move Nxf3 test position Uri Blass 23:43:53 12/28/00
    - Re: Avoid move Nxf3 test position Howard Exner 00:28:05 12/29/00
      - Re: Avoid move Nxf3 test position Howard Exner 00:52:25 12/29/00
        
        Re: Avoid move Nxf3 test position Uri Blass 02:18:43 12/29/00
Re: Avoid move Nxf3 test position Vincent Diepeveen 05:44:25 12/28/00
- Re: Avoid move Nxf3 test position Dieter Buerssner 07:36:57 12/28/00
  - Re: Avoid move Nxf3 test position Uri Blass 11:41:54 12/28/00
    - Re: Avoid move Nxf3 test position Dieter Buerssner 16:22:40 12/28/00
      - Re: Avoid move Nxf3 test position Dann Corbit 22:16:18 12/28/00
    - Re: Avoid move Nxf3 test position José Antônio Fabiano Mendes 12:28:56 12/28/00
      - Re: Avoid move Nxf3 test position Uri Blass 12:55:25 12/28/00
        
        Re: Avoid move Nxf3 test position José Antônio Fabiano Mendes 09:27:12 12/29/00

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