Author: Peter Berger
Date: 05:35:37 10/31/02
Crafty seems to evaluate KRRKRN as a dead draw.
KnightDreamer v3.1b - Crafty-19.0
[D]5R2/8/8/5n1R/4k1rP/8/5K2/8 b - - 0 1
Analysis by Crafty 19.01:
77...Sxh4 78.Txh4 Txh4
= (0.00) Tiefe: 12/22 00:00:06 4463kN, tb=5298
77...Sxh4 78.Txh4 Txh4
= (0.00) Tiefe: 13/23 00:00:16 11939kN, tb=11852
How about this one? Still dead draw according to Crafty - or is it?
KnightDreamer v3.1b - Crafty-19.0
[D]8/8/2R5/1R6/4rn2/8/8/k4K2 b - - 0 1
Analysis by Yace after a little training:
92...Ta4 93.Ke1 Ta7 94.Kd2 Ka2 95.Kc2 Se2 96.Td6 Ka3 97.Tb3+ Ka4 98.Tb1 Ka5
99.Ta1+ Kb5 100.Txa7 Kc5 101.Kd3 Sc1+ 102.Kd2
+- (7.39) Tiefe: 15/29 00:00:02 1531kN
I haven't checked with 6-men statistics or tablebases, but I really doubt that
this ending is that drawish at all in general - at least a 0.0 can lead to
serious problems as in this blitzgame:
[Event "Computer chess game"]
[Site "P422"]
[Date "2002.10.31"]
[Round "1"]
[White "KnightDreamer v3.1b"]
[Black "Crafty-19.0"]
[Result "1-0"]
[TimeControl "240+2"]
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 d5 6. a3 Bxc3+ 7. Nxc3 cxd4
8. exd4 dxc4 9. Bxc4 Nc6 10. Be3 O-O 11. O-O b6 12. Qd3 Bb7 13. Rad1 h6 14.
f3 Rc8 15. Rfe1 Ne7 16. Bd2 Nf5 17. Bf4 Nh5 18. Be5 Nh4 19. Ne4 Bxe4 20.
Rxe4 Ng6 21. Ba6 Rc6 22. Qb5 Qd5 23. Qa4 f6 24. Kh1 Kh8 25. Bb7 b5 26. Bxc6
Qxc6 27. Qxa7 Qc2 28. Rde1 fxe5 29. R4e2 Qd3 30. dxe5 Nhf4 31. Qe3 Rd8 32.
Qxd3 Nxd3 33. Ra1 Kh7 34. b3 Rc8 35. a4 Rc3 36. a5 Ngf4 37. Rd2 Nc5 38.
Rda2 Na6 39. Rb1 Nd3 40. Kg1 Nxe5 41. Rab2 Nc6 42. Rd2 b4 43. Ra2 Kg6 44.
Re1 Kf5 45. Rd2 Rxb3 46. Rd6 Nab8 47. Rdxe6 Ra3 48. h4 h5 49. R1e4 Ra1+ 50.
Kh2 Ra2 51. a6 Nd4 52. a7 Nbc6 53. a8=Q Nxf3+ 54. Kg3 Rxa8 55. gxf3 Ra6 56.
Rd6 b3 57. Rd5+ Kf6 58. Rb5 Ne7 59. Rf4+ Ke6 60. Rxb3 Nf5+ 61. Kh3 Kf6 62.
Rc4 Rd6 63. Rc8 g6 64. Rf8+ Kg7 65. Ra8 Rd1 66. f4 Kf7 67. Rb7+ Ke6 68.
Rb6+ Nd6 69. Rba6 Rd4 70. Kg3 Kf5 71. Rf8+ Ke4 72. Kf2 Kd3 73. Kg1 Nf5 74.
Rxg6 Rxf4 75. Rg5 Ke4 76. Rxh5 Rg4+ 77. Kf2 Nxh4 78. Re8+ Kd3 79. Re3+ Kd2
80. Rd5+ Kc1 81. Rc3+ Kb2 82. Rh3 Rg2+ 83. Kf1 Rg4 84. Rd2+ Kc1 85. Rf2 Re4
86. Rhh2 Ng6 87. Ra2 Kb1 88. Rhb2+ Kc1 89. Rc2+ Kb1 90. Rab2+ Ka1 91. Rb5
Nf4 92. Rc6 Ra4 93. Ke1 Nd3+ 94. Kd2 Nf4 95. Re5 Ng2 96. Rc2 Rf4 97. Re2
Rh4 98. Rxg2 Rh1 99. Kd3 Rh3+ 100. Ke2 Rh1 101. Rd2 Kb1 102. Rd1+ Kc2 103.
Rxh1 Kc3 104. Rh4 Kb2 105. Kd1+ Kc3 106. Rg3+ Kb2 107. Ra4 Kb1 108. Rb3#
{KnightDreamer checkmates!} 1-0
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