Author: Jeremiah Penery
Date: 18:28:39 11/28/99
Go up one level in this thread
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#!
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