Author: Thom Perry
Date: 02:03:47 11/29/99
Go up one level in this thread
On November 28, 1999 at 21:28:39, Jeremiah Penery wrote: >On November 28, 1999 at 19:57:04, Heiner Marxen wrote: > >>On November 28, 1999 at 06:55:05, Enrique Irazoqui wrote: >> >>>On November 26, 1999 at 16:22:25, Trefor Deane wrote: >>> >>>>I thought i would let Crafty 16.6 look at this end-game position,(black to >>>>move)and I was totally amazed when it came up with Mate in 74 moves (not ply) >>>>faster than i could say '' Eugine Namilov'' Simply Amazing !! >>>>the position was as follows.... >>>> >>>>white king c3, white rook c4, white pawn b2, black king e4, black rook d1 >>> >>>Sorry to spoil it, but this is a mate in 14. >> >>Are you sure? For >>8/8/8/8/2R1k3/2K5/1P6/3r4 b - - >>neither black will mate the white in 14 moves, nor will black move and >>be mated by white in 14 moves, except when moving Rd4, in which case >>white mates in 10, starting with Rxd4+. All this according to CHEST. >> >>Can you give more details why you think it is a mate in 14? How about a PV? > >I do not have a PV for mate in 14, but here is the PV for mate in 74: >Moves with a '!' are the 'best' move in the position - the only move that is >either the fastest way to win or the slowest way to lose. >I'm not sure why it's 74, either. Looks like 75 to me... > >1. ... Ke5! 2. Rc5+! Kd6! 3. Kb4! Rb1! 4. Rc2! Rf1 5. Kb5! Rf5+! >6. Kb6! Rf8! 7. Rd2+! Ke5! 8. Kc7 Rf1 9. Kc6! Rc1+! 10. Kb5! Rc8! >11. Rh2! Rb8+! 12. Kc6! Ke6! 13. Rh6+! Ke7 14. Rh7+! Ke6! 15. Rh2! >Ke7! 16. Kc7! Rb3 17. Re2+! Kf7! 18. Kc6! Rb8! 19. Kd5 Kf6! 20. Kc5! >Rc8+! 21. Kd6! Rb8! 22. Rf2+! Kg6! 23. Kc6! Kg7! 24. Kc5! Rc8+! 25. >Kd5 Rb8 26. Kc4! Rc8+! 27. Kd3 Rb8 28. Kc2! Rc8+! 29. Kb1! Rb8! 30. >Rf4! Kg6! 31. Ka2! Ra8+! 32. Kb3! Rh8! 33. Ka3! Ra8+ 34. Ra4! Rb8! >35. b3! Kf6! 36. Re4! Ra8+ 37. Kb4! Rc8 38. Kb5! Rb8+ 39. Kc4! Rc8+ >40. Kd5! Rd8+ 41. Kc6! Kf5! 42. Rh4 Rc8+ 43. Kd7 Rc1 44. b4! Rb1 >45. Rc4 Kf6! 46. Kc6! Ke7! 47. b5! Kd8! 48. Ra4! Rc1+! 49. Kb7! Rc7+! >50. Ka6! Rc1 51. b6! Kc8! 52. Ka7! Rb1! 53. Rc4+! Kd7! 54. b7! Ra1+! >55. Kb8! Rb1 56. Ra4! Rb2 57. Ra7 Rb1 58. Ka8! Kd6! 59. b8=R! Rc1 >60. Rb5 Rc8+! 61. Kb7! Rc1 62. Ra6+ Kd7! 63. Rh6 Rc7+! 64. Kb8 Rc8+! >65. Ka7! Rc7+! 66. Rb7! Rxb7+! 67. Kxb7! Ke7! 68. Kc8 Kf7 69. Rd6 >Ke7 70. Kc7! Kf7 71. Kd8 Kf8 72. Rd7! Kg8! 73. Ke8! Kh8! 74. Kf7! >Kh7! 75. Rd6! Kh8! 76. Rh6#! Which program did you use for this analysis? The ! tag after the optimum moves is cool.
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