Author: John Merlino
Date: 12:52:38 02/25/00
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On February 25, 2000 at 01:17:19, Howard Exner wrote: >No it's not the sequel to "Analyse This" but an odd position I discovered >while I was recently looking for a Kevin Spraggett article in my old chess >magazines. It is a 1913 study by J. Krejcik from Nathan Divinsky's column in "En >Passant" #110 from 1991. > >[D]8/1p1p4/3p2p1/5pP1/1p3P2/1P1p1P1k/1P1P1P1p/5K1B w - - > >If you set your chess program to blitz, and autoplay this I'll wager that some >programs will stumble on to the winning sequence of moves. Running with the king >to a2 and marching back to its initial position, forcing black to move a pawn - >repeat till black's pawn moves are exhausted, when the Black King must finally >move. It's of course not meant as a find the winning move test as it runs around >100 moves to its completion. Perhaps 2 minutes per side or less could reveal >some programs making this crazy to and fro march. Like someone else posted, Chessmaster produced the following results: 1. Ke1 Kh4 2. Kd1 Kh3 3. Kc1 Kh4 4. Kb1 Kh3 5. Ka2 Kh4 6. Ka1 Kh3 7. Kb1 Kh4 8. Kc1 Kh3 9. Kd1 Kh4 10. Ke1 Kh3 11. Kf1 d5 12.Ke1 Kh4 13. Kd1 Kh3 14. Kc1 Kh4 15. Kb1 Kh3 16. Ka2 Kh4 17. Ka1 Kh3 18.Kb1 Kh4 19. Kc1 Kh3 20. Kd1 Kh4 21. Ke1 Kh3 22. Kf1 d6 23. Ke1 Kh4 24.Kd1 Kh3 25. Kc1 Kh4 26. Kb1 Kh3 27. Ka2 Kh4 28. Ka1 Kh3 29. Kb1 Kh4 30.Kc1 Kh3 31. Kd1 Kh4 32. Ke1 Kh3 33. Kf1 d4 34. Ke1 Kh4 35. Kd1 Kh3 36.Kc1 Kh4 37. Kb1 Kh3 38. Ka2 Kh4 39. Ka1 Kh3 40. Kb1 Kh4 41. Kc1 Kh3 42.Kd1 Kh4 43. Ke1 Kh3 44. Kf1 d5 45. Ke1 Kh4 46. Kd1 Kh3 47. Kc1 Kh4 48. Kb1 Kh3 49. Ka1 Kh4 50. Ka2 Kh3 51. Kb1 Kh4 52. Kc1 Kh3 53. Kd1 Kh4 54.Ke1 Kh3 55. Kf1 b6 56. Ke1 Kh4 57. Kd1 Kh3 58. Kc1 Kh4 59. Kb1 Kh3 60.Ka2 Kh4 61. Ka1 Kh3 62. Kb1 Kh4 63. Kc1 Kh3 64. Kd1 Kh4 65. Ke1 Kh3 66.Kf1 b5 67. Ke1 Kh4 68. Kd1 Kh3 69. Kc1 Kh4 70. Kb1 Kh3 71. Ka2 Kh4 72.Ka1 Kh3 73. Kb1 Kh4 74. Kc1 Kh3 75. Kd1 Kh4 76. Ke1 Kh3 77. Kf1 Kh4 78.Kg2 Kh5 79. Kxh2 Kh4 80. Bg2 Kh5 81. Bh3 Kh4 82. Bxf5 gxf5 83. g6 Kh5 84. g7 Kg6 85. g8=Q+ Kf6 86. Qe8 Kg7 87. Qe7+ Kg6 88. Qe6+ Kg7 89. Qxf5 Kg8 90. Qf6 Kh7 91. f5 Kg8 92. Qe7 Kh8 93. f6 Kg8 94. Qg7# 1-0 I discovered something very interesting, however. Some of you reported letting your engine go to 30+ (or even 50+) ply. Oddly enough, The King will NEVER look past 20 ply! I set the time control to "infinite" (usually used for game analysis), and after getting to a depth of x/20 (x being somewhere between 17 and 19 usually), the engine automatically moved! Apparently, that's the limit of the engine's depth search.... Hmmm..... jm
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