Mate on 50th move again; Aristarch, GLC and Crafty

[Robert Allgeuer]

Geschrieben von:/Posted by: Robert Allgeuer at 08 June 2004 22:34:31:

Aristarch 4.50 mates on exactly the 50th move, nevertheless it claims only a draw. But I also think that GLC 3.00 has a problem, because it allows this mating move, apparently it is already sure that the game is draw.
When analysing teh position before the very last move with Crafty 19.6, it seems that it has a similar problem: it proposes Qb7 and draw score, although it could mate.
Robert

[Event "Aristarch 4.50 gauntlet"]
[Site "DISCO"]
[Date "2004.05.30"]
[Round "3.1"]
[White "Aristarch v4.50"]
[Black "Green Light Chess v3.00"]
[Result "1/2-1/2"]
[TimeControl "300+2"]
[Number "2623"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nf3 Be7 8.
Bc4 O-O 9. Qe2 Nc6 10. Rd1 b5 11. Bb3 Bg4 12. h3 Bh5 13. a4 bxa4 14. Bxa4
Nd4 15. Bxd4 exd4 16. Rxd4 Bxf3 17. Qxf3 Qb6 18. Rd3 Qxb2 19. O-O Rab8 20.
Bb3 Kh8 21. Rb1 Qa3 22. Nd5 Nxd5 23. Rxd5 Rb4 24. Rbd1 h6 25. Rf5 f6 26.
Rh5 Rb5 27. Rxb5 axb5 28. Qf5 Qa8 29. Qe6 Qb7 30. Ra1 Rb8 31. Ra5 Qb6 32.
Ra2 Qc7 33. Bd5 b4 34. g3 Kh7 35. Ra4 h5 36. e5 Kh6 37. Be4 d5 38. exf6
Bxf6 39. Qxd5 Qe5 40. Qd2+ Qg5 41. Qe1 Bd4 42. Kf1 Qb5+ 43. Bd3 Qc6 44. Ra6
Rb6 45. Qd2+ g5 46. h4 Qh1+ 47. Ke2 Qd5 48. Rxb6+ Bxb6 49. Qxb4 Qe5+ 50.
Kf1 Bc5 51. hxg5+ Kxg5 52. Qb7 Kf6 53. Qh7 Qd5 54. Be4 Qd4 55. Qf5+ Ke7 56.
Kg2 Kd6 57. Qf3 Kc7 58. c3 Qg7 59. Qf4+ Bd6 60. Qe3 Be5 61. Qc5+ Kd8 62.
Bf5 Bf6 63. Kh1 Ke8 64. Qc8+ Bd8 65. Qe6+ Kf8 66. Qd6+ Qe7 67. Qh6+ Qg7 68.
Qxh5 Qxc3 69. Kg1 Bf6 70. Qh6+ Ke7 71. Qh7+ Kd6 72. Qd7+ Kc5 73. Qc7+ Kb4
74. Qb6+ Ka3 75. Qa6+ Kb4 76. Qd6+ Ka5 77. Qd5+ Kb6 78. Be4 Bd4 79. Kg2 Qd2
80. Qd6+ Kb5 81. Qd7+ Kb4 82. Qf5 Bb6 83. g4 Bd8 84. Bc6 Bg5 85. Qb5+ Kc3
86. Bd5 Qf4 87. Qb3+ Kd4 88. Bf3 Kc5 89. Qd5+ Kb4 90. Bd1 Qd2 91. Qb7+ Kc5
92. Qc7+ Kb4 93. Qb6+ Kc4 94. Bb3+ Kc3 95. Be6 Qf4 96. Qc5+ Kb2 97. Qb5+
Kc3 98. Qa5+ Kd3 99. Qd5+ Ke2 100. Qb5+ Kd2 101. Kf1 Kc3 102. Qb3+ Kd4 103.
Qd5+ Kc3 104. Qb7 Kd4 105. Kg1 Kc5 106. Qa6 Qe5 107. Bc4 Kb4 108. Be2 Qf4
109. Qb5+ Kc3 110. Bd1 Kd4 111. Kf1 Qc1 112. Kg2 Qc5 113. Qb2+ Qc3 114. Qb8
Qc6+ 115. Bf3 Qc5 116. Qa8 Kc3 117. Be4 Kd4 118. Bb7 Qc1 119. Bf3 Qf4 120.
Qc6 Kd3 121. Qc5 Kd2 122. Qa3 Kc2 123. Qa2+ Kc3 124. Be2 Kd4 125. Qa5 Qe4+
126. Bf3 Qf4 127. Qb5 Kc3 128. Qb1 Bh4 129. Qh1 Bg5 130. Qa1+ Kb4 131. Qb2+
Ka5 132. Be2 Bf6 133. Qb5# { 50 move rule } 1/2-1/2