Author: Uri Blass
Date: 07:21:58 11/10/04
Go up one level in this thread
On November 10, 2004 at 09:19:18, Mike Byrne wrote:
>On November 10, 2004 at 08:34:04, Uri Blass wrote:
>
>>No proof but here is some analysis
>>
>>[Event "Blitz:120'"]
>>[Site "MyTown"]
>>[Date "????.??.??"]
>>[Round "?"]
>>[White "Byrne, Michael"]
>>[Black "Fritz 8"]
>>[Result "1-0"]
>>[SetUp "1"]
>>[FEN "q4b2/1pk1pPp1/p3P1P1/P4p1p/1p3P2/1p6/3K1Q1P/8 w - - 0 1"]
>>[PlyCount "138"]
>>[TimeControl "7200"]
>>
>>1. Qc5+ Kb8 2. Qe5+ Kc8 3. Qd5 Kc7 4. Qd7+ Kb8 5. Qd8+ Ka7 6. Qb6+ Kb8 7. Kc1
>>Kc8 8. Qc5+ Kb8 9. Qe5+ Kc8 10. Qd5 Kc7 11. Qd7+ Kb8 12. Qd8+ Ka7 13. Qb6+ Kb8
>>14. Kb2 Kc8 15. Qc5+ Kb8 16. Qe5+ Kc8 17. Qd5 Kc7 18. Qd7+ Kb8 19. Qd8+ Ka7 20.
>>Qb6+ Kb8 21. Kxb3 Kc8 22. Qc5+ Kb8 23. Qe5+ Kc8 24. Qd5 Kc7 25. Qd7+ Kb8 26.
>>Qd8+ Ka7 27. Qb6+ (27. Qd4+ Kb8 28. Kxb4 b5) 27... Kb8 28. Kxb4 Kc8 29. Qc5+
>>Kb8 30. Qe5+ {[%emt 0:00:00]} Kc8 31. Qd5 Kc7 32. Qd7+ Kb8 33. Qd8+ Ka7 34.
>>Qb6+ Kb8 35. Kc3 Kc8 36. Qc5+ Kb8 37. Qe5+ Kc8 38. Qd5 Kc7 39. Qd7+ Kb8 40.
>>Qd8+ Ka7 41. Qb6+ Kb8 42. Kd3 Kc8 43. Qc5+ Kb8 44. Qe5+ Kc8 45. Qd5 Kc7 46.
>>Qd7+ Kb8 47. Qd8+ Ka7 48. Qb6+ Kb8 49. Ke2 Kc8 50. Qc5+ Kb8 51. Qe5+ Kc8 52.
>>Qd5 Kc7 53. Qd7+ Kb8 54. Qd8+ Ka7 55. Qb6+ Kb8 56. Kf3 Kc8 57. Qc5+ Kb8 58.
>>Qe5+ Kc8 59. Qd5 Kc7 60. Qd7+ Kb8 61. Qd8+ Ka7 62. Qb6+ Kb8 63. Kg3 Kc8 64.
>>Qc5+ Kb8 65. Qe5+ Kc8 66. Qd5 Kc7 67. Qd7+ Kb8 68. Qd8+ Ka7 69. Qb6+ (69. Qd4+
>>Kb8 70. Kh4 Kc8 (70... b5 71. axb6 a5 72. Qd7 Qb7 (72... Qa6 73. Qc7+ Ka8 74.
>>Qd8+ Kb7 75. Qxf8 Qe2 76. Qxe7+ Ka6 77. Qa7+ Kb5 78. Qd7+) 73. Qe8+ Qc8 74. Kg5
>>h4 75. Kxh4 a4 76. Qxa4 Qc6 77. Qa6 Qb7 78. Qxb7+ Kxb7 79. Kg5) 71. Qd7+ Kb8
>>72. Qd8+ Ka7 73. Qb6+ (73. Qd4+ Kb8 74. Kxh5 b5 75. axb6) 73... Kb8 74. Kxh5
>>Kc8 75. Qc5+ Kb8 76. Qe5+ Kc8 77. Qd5 Kb8 78. Qd8+ Ka7 79. Qb6+ Kb8 80. Kg5 Kc8
>>81. Qc5+ Kb8 82. Qe5+ Kc8 83. Qd5 Kb8 84. Qd8+ Ka7 85. Qb6+ Kb8 86. h4 Kc8 87.
>>Qc5+ Kb8 88. Qe5+ Ka7 89. Qd4+ Kb8 90. Qd8+ Ka7 91. Qb6+ Kb8 92. Kxf5 Kc8 93.
>>Qc5+ Kb8 94. Qe5+ Kc8 95. Qd5 Kb8 96. Qd8+ Ka7 97. Qb6+ Kb8 98. h5 Kc8 99. h6
>>Qb8 (99... gxh6 100. Qc5+ Kd8 101. g7 Bxg7 102. Qd5+ Kc8 103. Qd7+ Kb8 104.
>>Qxe7 b6 105. Qd6+ Kb7 106. Qd7+ Kb8 107. e7 Qb7 108. f8=Q+ Bxf8 109. exf8=Q+
>>Ka7 110. axb6+ Kxb6 111. Qb4+ Ka7 112. Qdxb7#) 100. h7 Qc7 (100... Qd6 101.
>>Qxd6 exd6 102. h8=Q) 101. Qxc7+ Kxc7 102. h8=Q Kc6 103. Qxf8 Kc5 104. Qxe7+ Kc4
>>105. Qa3 b6 106. f8=Q Kd5 107. Qfd6+ Kc4 108. Qdd3#) 69... Kb8 1-0
>
>I agree - it's a mate in 131 and most likely it is shorter.
There are some lines that were not the best for black and I could prove with
yace only mate in 116 somewhere near move 70...Kc8
After 70...b5 I did not prove checkmate score but the score was high enough for
white to convince me that it is proabably a shorter mate than mate in 116 so I
believe that it is mate in at most 116 moves and maybe white can improve the
lines that I gave.
Uri
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