Author: Uri Blass
Date: 07:06:00 06/15/01
Go up one level in this thread
On June 15, 2001 at 09:25:16, Jim Monaghan wrote: >On June 15, 2001 at 06:00:35, Andreas Stabel wrote: > >>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 > >Very good guys ... that's the right track. I will end the suspense. >The position is from "360 Brilliant and Instructive Endgames", an addendum to >#127. > >Troitzky's note follows: > >"Here after 1.Be1 Rh6 2.Kg7 Rh5; White's king returns six times to g7 waiting >for Black's move Rh6. 1.Be1 Rh6 2.Kg7 Rh5 3.Kxf7 seems to be a shorter win for white in this line. What did I miss? Uri
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