Scorpio cannot mate in KQKR ending

[Gábor Szots]

Just finished in SzG Swiss:

[Event "45 Minuten/Partie + 15 Sekunden/Zug"]
[Site "Engine Match"]
[Date "2005.10.15"]
[Round "1"]
[White "Scorpio 1.5"]
[Black "Thinker 4.7a"]
[Result "1/2-1/2"]

1. e4 {Buch 0s} c5 {+0.01/1 0s} 2. Nf3 {Buch 0s} e6
{+0.01/1 0s} 3. d4 {Buch 0s} cxd4 {+0.01/1 0s} 4. Nxd4
{Buch 0s} a6 {+0.01/1 0s} 5. Bd3 {Buch 0s} Nf6 {+0.01/1 0s}
6. O-O {Buch 0s} Qc7 {+0.01/1 0s} 7. Qe2 {Buch 0s} d6
{+0.01/1 0s} 8. c4 {Buch 0s} g6 {+0.01/1 0s} 9. Nc3 {Buch
0s} Bg7 {+0.01/1 0s} 10. Rd1 {Buch 0s} O-O {+0.01/1 0s}
11. Nf3 {Buch 0s} Nbd7 {+0.01/1 0s} 12. h3 {Buch 0s} b6
{-0.21/10 1:05m} 13. Bf4 {Buch 0s} Nh5 {-0.17/12 1:04m}
14. Be3 {+0.51/13 1:33m} Bb7 {-0.13/10 1:03m} 15. Rac1
{+0.48/13 1:31m} Rac8 {-0.15/11 1:02m} 16. b4 {+0.44/12
1:29m} Rfe8 {-0.18/10 1:02m} 17. Qd2 {+0.43/11 1:27m} Red8
{-0.21/11 1:05m} 18. Bg5 {+0.56/12 1:25m} f6 {-0.24/11
1:44m} 19. Be3 {+0.72/13 1:23m} Bf8 {-0.27/9 58s} 20. Qb2
{+0.81/12 1:21m} Ng7 {-0.27/10 57s} 21. Rd2 {+0.70/12
1:19m} Be7 {-0.11/9 1:28m} 22. Bh6 {+0.59/12 1:17m} Bf8
{-0.22/10 58s} 23. a3 {+0.83/12 1:16m} Nh5 {-0.25/11 55s}
24. Be3 {+0.80/12 1:14m} Ng7 {-0.25/11 1:47m} 25. Qa2
{+0.85/11 1:13m} Rb8 {-0.27/10 53s} 26. Qb3 {+0.93/12
1:11m} Rbc8 {-0.27/10 57s} 27. Be2 {+0.78/12 1:10m} f5
{-0.27/12 1:33m} 28. exf5 {+0.68/11 1:08m} Nxf5 {-0.27/11
49s} 29. c5 {+0.35/11 1:06m} d5 {-0.15/11 1:36m} 30. cxb6
{+0.28/12 1:05m} Qd6 {-0.12/11 46s} 31. Bg5 {+0.22/12
1:04m} Be7 {+0.07/10 47s} 32. Bxe7 {+0.17/11 1:02m} Qxe7
{+0.05/11 45s} 33. Re1 {-0.11/12 1:01m} Nxb6 {+0.32/9 45s}
34. Bd3 {-0.08/13 1:00m} Qf6 {+0.12/11 44s} 35. Rc2
{-0.10/13 59s} Nd6 {0.00/10 44s} 36. Na4 {+0.02/13 57s}
Nxa4 {-0.03/12 43s} 37. Rxc8 {+0.09/14 57s} Rxc8 {-0.15/12
42s} 38. Qxa4 {+0.09/14 55s} Rc6 {-0.48/13 42s} 39. Qa5
{+0.20/14 54s} Nc4 {-0.20/12 41s} 40. Bxc4 {+0.24/15 53s}
Rxc4 {-0.26/13 41s} 41. Ne5 {+0.32/15 52s} Rc2 {-0.30/14
44s} 42. Qb6 {+0.32/15 51s} Bc8 {-0.37/10 40s} 43. a4
{+0.32/14 50s} Qf4 {-0.16/10 39s} 44. g3 {+0.47/15 49s} Qf8
{-0.39/12 39s} 45. b5 {+0.57/14 48s} axb5 {-0.77/13 38s}
46. axb5 {+0.67/15 47s} Rc5 {-0.70/11 38s} 47. Ra1
{+0.79/15 46s} d4 {-0.49/10 38s} 48. Nd3 {+0.89/14 45s} Rc4
{-0.90/13 37s} 49. Ra7 {+1.53/14 45s} e5 {-1.44/12 37s}
50. Qa5 {+2.37/13 44s} e4 {-1.66/12 36s} 51. Qa2 {+2.80/15
43s} Be6 {-1.68/13 36s} 52. Ra8 {+2.91/15 42s} exd3
{-1.88/14 36s} 53. Rxf8+ {+2.91/14 42s} Kxf8 {-1.81/11 35s}
54. Kh2 {+2.91/14 41s} Kf7 {-1.92/12 34s} 55. b6 {+3.00/14
40s} Rb4 {-1.99/13 37s} 56. Qa7+ {+3.07/14 39s} Kf6
{-2.28/14 34s} 57. Qb8 {+3.09/13 38s} Ke7 {-1.92/11 47s}
58. Qc7+ {+3.28/14 38s} Kf6 {-2.31/13 33s} 59. Qf4+
{+3.28/13 37s} Ke7 {-2.54/13 32s} 60. Qh4+ {+3.49/14 37s}
Kd7 {-2.36/13 32s} 61. Qxh7+ {+4.32/14 36s} Kd6 {-2.88/14
32s} 62. Qxg6 {+4.59/15 35s} Rxb6 {-2.45/14 36s} 63. Qxd3
{+4.77/15 35s} Kc5 {-2.57/13 31s} 64. Qa3+ {+4.94/15 34s}
Kb5 {-2.42/11 34s} 65. g4 {+4.88/15 34s} Bc4 {-2.25/11 34s}
66. Kg3 {+4.87/14 33s} Ra6 {-2.25/12 30s} 67. Qc1 {+4.62/14
33s} d3 {-2.20/12 30s} 68. h4 {+4.80/13 32s} Rd6 {-2.46/11
1:17m} 69. Qd2 {+5.40/14 32s} Ra6 {-3.08/12 28s} 70. h5
{+5.25/13 31s} Ra2 {-3.18/12 28s} 71. Qg5+ {+5.54/13 31s}
Kb4 {-3.23/12 1:06m} 72. h6 {+5.58/12 30s} d2 {-3.23/11
27s} 73. Qe7+ {+5.37/13 30s} Kb3 {-3.48/12 27s} 74. Qe3+
{+5.64/13 30s} Kc2 {-3.86/13 27s} 75. h7 {+5.60/13 29s}
d1=Q {-3.93/12 26s} 76. h8=Q {+5.72/12 29s} Qd3 {-3.74/11
42s} 77. Qxd3+ {+5.85/13 28s} Bxd3 {-3.70/11 30s} 78. f4
{+6.07/13 28s} Ra3 {-4.05/12 25s} 79. Qh2+ {+6.21/13 28s}
Kc1 {-4.52/13 25s} 80. Kh4 {+6.54/14 27s} Ra6 {-4.50/13
27s} 81. g5 {+6.76/13 27s} Ra4 {-4.53/12 32s} 82. g6
{+7.48/12 27s} Bxg6 {-4.38/12 24s} 83. Qg1+ {+8.76/14 26s}
Kd2 {-4.46/14 24s} 84. Qxg6 {+8.92/14 26s} Rxf4+ {-4.53/14
24s} 85. Kh3 {+8.92/15 26s} Ke3 {-4.38/13 24s} 86. Qh6
{+9.04/13 25s} Ke4 {-4.46/16 23s} 87. Kh2 {+9.04/13 25s}
Ke5 {-4.46/13 24s} 88. Qg5+ {+9.00/13 25s} Rf5 {-4.76/16
23s} 89. Qe7+ {+9.00/14 24s} Kd5 {-4.46/15 23s} 90. Qe8
{+9.00/13 24s} Rf2+ {-4.46/14 26s} 91. Kg1 {+9.00/14 24s}
Rb2 {-4.38/11 23s} 92. Qf7+ {+9.00/14 24s} Kc5 {-4.53/15
23s} 93. Qf5+ {+9.00/14 23s} Kb4 {-4.53/14 23s} 94. Qe4+
{+8.98/15 23s} Ka5 {-4.57/16 22s} 95. Qe1+ {+8.98/14 23s}
Rb4 {-4.57/13 22s} 96. Kh1 {+8.96/14 23s} Kb5 {-4.46/13
22s} 97. Qe8+ {+8.96/14 23s} Kc5 {-4.50/15 23s} 98. Qe7+
{+8.96/14 22s} Kc4 {-4.53/15 21s} 99. Qe4+ {+8.96/14 22s}
Kc3 {-4.50/13 21s} 100. Qc6+ {+8.96/15 22s} Rc4 {-4.53/13
21s} 101. Qf6+ {+8.96/14 22s} Kd3 {-4.53/15 21s} 102. Qa6
{+8.96/15 21s} Kd4 {-4.53/13 21s} 103. Qa7+ {+8.96/13 21s}
Rc5 {-4.53/16 21s} 104. Qa1+ {+8.92/13 21s} Kd5 {-4.53/15
21s} 105. Kh2 {+8.88/13 21s} Kc4 {-4.53/15 21s} 106. Qa4+
{+8.92/13 21s} Kd5 {-4.53/15 21s} 107. Qd7+ {+8.88/14 21s}
Kc4 {-4.53/14 20s} 108. Qe8 {+8.88/15 20s} Kb4 {-4.53/13
20s} 109. Qb8+ {+8.88/16 20s} Rb5 {-4.53/14 20s} 110. Qf8+
{+8.88/15 20s} Kc4 {-4.38/11 20s} 111. Qf7+ {+8.88/15 20s}
Kd4 {-4.38/11 20s} 112. Qf6+ {+8.88/14 20s} Re5 {-4.35/11
20s} 113. Kh1 {+9.00/14 19s} Kd5 {-4.31/12 20s} 114. Qf3+
{+9.00/15 19s} Kd4 {-4.31/12 20s} 115. Qf4+ {+9.00/15 19s}
Kd5 {-4.38/12 20s} 116. Qg3 {+8.98/14 19s} Kd4 {-4.31/12
19s} 117. Qg7 {+9.00/14 19s} Kd5 {-4.35/12 20s} 118. Qg8+
{+9.00/14 19s} Kd4 {-4.31/11 19s} 119. Qh8 {+9.00/15 19s}
Kd5 {-4.31/11 19s} 120. Qa8+ {+9.00/15 19s} Kd6 {-4.31/12
19s} 121. Qf8+ {+8.90/13 19s} Kd7 {-4.38/12 19s} 122. Qg7+
{+8.96/14 18s} Kd6 {-4.31/11 19s} 123. Qg3 {+8.96/14 18s}
Ke6 {-4.31/11 19s} 124. Qb3+ {+8.92/13 18s} Kd6 {-4.31/11
19s} 125. Qb6+ {+8.90/15 18s} Kd5 {-4.31/11 19s} 126. Qa5+
{+8.90/15 18s} Ke6 {-4.31/11 19s} 127. Qa6+ {+8.08/15 19s}
Kd5 {-4.31/12 19s} 128. Qb5+ {0.00/19 19s} Ke6 {0.00/12
18s} 129. Qc6+ {0.00/43 19s} Ke7 {0.00/13 7s} 130. Kg2
{0.00/51 19s} Re2+ {0.00/25 2s} 131. Kf3 {0.00/55 19s} Re1
{0.00/27 1s} 132. Kg4 {0.00/67 18s} Rg1+ {0.00/27 0s}
133. Kh4 {0.00/70 1s} Rg8 {0.00/27 0s} 134. Qc3 {0.00/70
0s} Rh8+ {0.00/27 0s} 1/2-1/2

G?bor

[Daniel Shawul]

Hi Gabor
thanks for pointing out the bug.
The problem is definately with the bitbases.
It is either due to wrong scoring scheme which prevents coversion
to a simpler ending OR due to corrupted KQKR bitbase.
best
daniel