Author: Andreas Stabel
Date: 03:00:35 06/15/01
Go up one level in this thread
On June 15, 2001 at 04:49:59, Uri Blass wrote: >On June 15, 2001 at 02:54:51, Dann Corbit wrote: > >>On June 15, 2001 at 02:40:05, Jim Monaghan wrote: >> >>>Well here it is folks. It's definitely not worth trying. I'm only posting it as >>>a curiousity. >>> >>>White to move and mate in 92 moves. Er, that's 183 plies ... :) >>> >>>[D] 7K/5p1p/3p2p1/B5pr/4n1pb/3N1bk1/4prn1/6RR w - - 0 1 >> >>Don't just leave us hanging! >> >>Be1 looks forced for sure. Then what? ... f5? ... d5? >>Where can I find the move sequence that leads to inescapable victory? > >I did not investigate the exact number of moves to mate but >I can explain the idea white needs to waste tempos in order to force black to >play pawn moves and finally to lose the rook and the game. > >The idea of a simple traingle does not work because the black knight can play a >check move with the knight, free the pieces, and win the game so we need to look >for safe squares for the king. > >We can find that all the black squares are safe for the king. >The white squares are not safe for the king except c2 so we need this square in >order to lose a tempo. > >White can find the following idea of wasting a tempo after Be1 by 22 plies > >Kh8-g7-f8-e7-d8-c7-b6-a5-b4-a3-b2-c2-c1-b2-a3-b4-a5-b6-c7-d8-e7-f8-g7 > >Black can play all the time Rh6-Rh5 moves but when the king gets into g7 black >need to move a pawn in order not to lose the rook >playing f7-f6 gives white the g8 square so it does not significantly help black. >Black also needs to play d6-d5 in order to prevent Kf7 and after these moves >black has 4 pawns moves(f5,f4,d4,h6) so white needs a lot of moves to convince >black to play these moves and avoid the Rh6-Rh5 story. > >Uri Before d6-d5 the f7 square is safe for the king or alternatively before f6-f5 the g8 square is safe for the king, so the first time the king doesn't have to go all the way to c2. After h7-h6, the rook has no moves, so the mate follows immediately. From this I get the solution below which is "only" 70 moves. What did I miss ? 1. Be1 f6 2. Kg7 d5 3. Kg8 Rh6 4. Kf8 Rh5 5. Kg7 d4 6. Kf8 Rh6 7. Ke7 Rh5 8. Kd8 Rh6 9. Kc7 Rh5 10. Kb6 Rh6 11. Ka5 Rh5 12. Kb4 Rh6 13. Ka3 Rh5 14. Kb2 Rh6 15. Kc2 Rh5 16. Kc1 Rh6 17. Kb2 Rh5 18. Ka3 Rh6 19. Kb4 Rh5 20. Ka5 Rh6 21. Kb6 Rh5 22. Kc7 Rh6 23. Kd8 Rh5 24. Ke7 Rh6 25. Kf8 Rh5 26. Kg7 f5 27. Kf8 Rh6 28. Ke7 Rh5 29. Kd8 Rh6 30. Kc7 Rh5 31. Kb6 Rh6 32. Ka5 Rh5 33. Kb4 Rh6 34. Ka3 Rh5 35. Kb2 Rh6 36. Kc2 Rh5 37. Kc1 Rh6 38. Kb2 Rh5 39. Ka3 Rh6 40. Kb4 Rh5 41. Ka5 Rh6 42. Kb6 Rh5 43. Kc7 Rh6 44. Kd8 Rh5 45. Ke7 Rh6 46. Kf8 Rh5 47. Kg7 f4 48. Kf8 Rh6 49. Ke7 Rh5 50. Kd8 Rh6 51. Kc7 Rh5 52. Kb6 Rh6 53. Ka5 Rh5 54. Kb4 Rh6 55. Ka3 Rh5 56. Kb2 Rh6 57. Kc2 Rh5 58. Kc1 Rh6 59. Kb2 Rh5 60. Ka3 Rh6 61. Kb4 Rh5 62. Ka5 Rh6 63. Kb6 Rh5 64. Kc7 Rh6 65. Kd8 Rh5 66. Ke7 Rh6 67. Kf8 Rh5 68. Kg7 h6 69. Kf8 Nf6 70. Bxf2# 1-0 Regards Andreas Stabel
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.