Author: Mike Byrne
Date: 17:49:50 08/21/02
Go up one level in this thread
On August 21, 2002 at 18:33:16, Jeroen van Dorp wrote: >[D]8/Q7/K7/5r2/5p2/8/6k1/8 w - - 0 1 >Mate in 103 / Mate in 104 > >I used Wilhelm to find out the longest mate wK+Q against bK+R+P from my >tablebases. It gave the above position. > >Wilhelm calls this a mate in 104 - mate on move 104? - but if I feed the >position in CB8 the tablebase engine calls it a mate in 103. > >Both use the same TB's; isn't there a convention how to call a mate read out >from the TB's? Or is it up to the GUI programmer to report it either way? > >J. I always attribute this descrepancy to user error. The user has to know if the program announce mate before the move or after the move. It's a mate in 104 BEFORE 1. Qg7+. It's a mate in 103 AFTER 1.Qg4. The convention should be standardize and I would guess most folks would prefer the BEFORE count - the way Chessmaster and Crafty do it. 1. Qg7+ Kf1 2. Qa1+ Kg2 3. Qa2+ Kg3 4. Qg8+ Kf2 5. Qe6 Rg5 6. Qf6 Rg4 7. Qd4+ Kg3 8. Qg1+ Kf3 9. Qh2 Rg3 10. Qh4 Rg4 11. Qh3+ Rg3 12. Qf5 Rg4 13. Kb7 Kg3 14. Qe5 Kh3 15. Qf6 Kg3 16. Qd6 Kh3 17. Qd3+ Kg2 18. Qd4 Rh4 19. Qd2+ Kf1 20. Qd5 Kf2 21. Qe4 Rg4 22. Qd4+ Kg3 23. Qg1+ Kf3 24. Qh2 Rg2 25. Qh4 Rg4 26. Qh3+ Rg3 27. Qf5 Rg2 28. Kc6 Rd2 29. Kc5 Ke3 30. Qg5 Rd3 31. Qe7+ Kf3 32. Qh4 Rd2 33. Kc4 Ke3 34. Qe1+ Re2 35. Qg1+ Ke4 36. Qg4 Rc2+ 37. Kb4 Rh2 38. Kc3 Ke3 39. Qe6+ Kf3 40. Kd3 Rg2 41. Qh3+ Rg3 42. Qh2 Kg4+ 43. Kd2 Re3 44. Qh8 Rh3 45. Qg8+ Kf3 46. Qg1 Rg3 47. Qd1+ Ke4 48. Qc2+ Ke5 49. Qc5+ Kf6 50. Ke2 Re3+ 51. Kf2 Rg3 52. Qd5 Re3 53. Kg2 Rg3+ 54. Kh2 Re3 55. Qg8 Rg3 56. Qh8+ Kg5 57. Qg7+ Kf5 58. Qh6 Ke5 59. Qf8 Re3 60. Qh8+ Ke6 61. Qh6+ Kf5 62. Qh5+ Ke4 63. Qg6+ Ke5 64. Qg5+ Ke4 65. Qf6 Re2+ 66. Kh3 f3 67. Qc3 Rg2 68. Qc1 Kd3 69. Qa3+ Ke4 70. Qc3 Rg5 71. Qc6+ Kf4 72. Qc1+ Kf5 73. Qe3 Kf6 74. Qxf3+ Ke6 75. Qc6+ Ke5 76. Qc5+ Kf6 77. Qd6+ Kf5 78. Qe7 Rg6 79. Qh7 Kg5 80. Kg3 Rf6 81. Qe4 Rf5 82. Qe7+ Rf6 83. Qd8 Kf5 84. Qd5+ Kg6 85. Kg4 Kg7 86. Qd8 Kf7 87. Kg5 Re6 88. Kf5 Re7 89. Qd5+ Kg7 90. Kg5 Rf7 91. Qd8 Rf1 92. Qd4+ Kf8 93. Kg6 Ke7 94. Qe4+ Kd6 95. Qd3+ Kc5 96. Qxf1 Kd5 97. Qa6 Kd4 98. Kf5 Kc3 99. Qb5 Kc2 100. Kf4 Kc1 101. Qb4 Kd1 102. Qb2 Ke1 103. Ke3 Kd1 104. Qd2#
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