Sometimes tablebases would be useful

[Volker Pittlik]

[Event "Computer chess game"]
[Site "vlk-ubuntu"]
[Date "2006.10.06"]
[Round "1"]
[White "Fruit 2.1"]
[Black "Aristarch 4.50 (c) 2004 Stefan Zipproth"]
[Result "1/2-1/2"]
[TimeControl "60+1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3 Bb4+ 6. Bd2 Be7 7. Bg2 c6 8.
Bc3 d5 9. Nbd2 Nbd7 10. O-O O-O 11. Re1 c5 12. e4 dxc4 13. Nxc4 cxd4 14.
Qxd4 Bc5 15. Qd2 Ng4 16. Re2 b5 17. Ba5 Nb6 18. Bxb6 axb6 19. Nb2 b4 20.
Nc4 Bxc4 21. bxc4 Qxd2 22. Rxd2 Rfd8 23. Re2 b3 24. a4 Rac8 25. Rb1 Rd3 26.
Kf1 Rcd8 27. Reb2 Nxf2 28. Rxb3 Nxe4 29. Rxd3 Rxd3 30. Ne5 Nd2+ 31. Ke2
Rxg3 32. hxg3 Nxb1 33. Kd3 Na3 34. Nd7 Bf2 35. Kc3 Be1+ 36. Kb3 Nb1 37.
Nxb6 Bxg3 38. Kc2 Na3+ 39. Kb3 Bf2 40. Nd7 Nb1 41. a5 Nd2+ 42. Kc3 Nb1+ 43.
Kc2 Nc3 44. Kxc3 Be1+ 45. Kd4 Bxa5 46. c5 h5 47. c6 g6 48. Kc5 Bc7 49. Nb6
g5 50. Na8 Bf4 51. c7 Bxc7 52. Nxc7 g4 53. Ne8 Kh7 54. Kd4 Kg6 55. Ke5 h4
56. Bc6 h3 57. Kf4 f5 58. Nc7 Kf6 59. Kg3 e5 60. Nd5+ Kg5 61. Ne7 Kf6 62.
Nc8 Kg5 63. Nb6 f4+ 64. Kh2 Kh4 65. Kg1 g3 66. Nc4 e4 67. Bxe4 Kg5 68. Ne5
Kf6 69. Nd3 Kg5 70. Kf1 Kg4 71. Ke2 Kg5 72. Kf3 g2 73. Kf2 Kf6 74. Bc6 f3
75. Bxf3 Kg5 76. Bc6 Kg4 77. Bd7+ Kh4 78. Nf4 h2 79. Kxg2 h1=Q+ 80. Kxh1
Kg3 81. Nd5 Kf3 82. Bf5 Kg3 83. Kg1 Kf3 84. Kf1 Kg3 85. Ke2 Kh4 86. Ke3 Kg5
87. Ke4 Kh6 88. Ke5 Kg7 89. Nf4 Kf7 90. Be6+ Kg7 91. Bd5 Kh7 92. Kf6 Kh8
93. Ng6+ Kh7 94. Ne7 Kh8 95. Nf5 Kh7 96. Bc4 Kh8 97. Ne7 Kh7 98. Bb5 Kh8
99. Kg5 Kg7 100. Nf5+ Kg8 101. Kf6 Kh8 102. Nd4 Kg8 103. Bc6 Kh8 104. Ba4
Kg8 105. Nf5 Kh8 106. Bb3 Kh7 107. Bd5 Kh8 108. Kg5 Kh7 109. Nd6 Kh8 110.
Bb3 Kg7 111. Ba4 Kf8 112. Kf6 Kg8 113. Bb5 Kf8 114. Bd3 Kg8 115. Nf5 Kh7
116. Ng7+ Kh8 117. Bg6 Kg8 118. Ne6 Kh8 119. Nd4 Kg8 120. Bh5 Kf8 121. Ne6+
Kg8 122. Kg5 Kh7 123. Bf7 Kh8 124. Nd4 Kg7 125. Bh5 Kf8 126. Kf6 Kg8 127.
Bd1 Kh8 128. Bf3 Kg8 129. Ke5 Kg7 130. Be4
{Draw by fifty-move rule} 1/2-1/2



[diag]8/6k1/8/4K3/3NB3/8/8/8 b - - 100 130[/diag]

Position at end of the game.

Volker

[Guenther Simon]

I believe the commercial Fruit is able to mate with B+N,
even without tablebases, but I don't remember exactly now.

Anyhow authors often leave some 'features' out(or bugs in)
in their free versions and fix them only later in their commercial
ones. Remember free Rybka and List e.g.

Regards,
Guenther

[Tony Thomas]

I have seen most engines resigning in K vs KNB endgames. Good thing Aristarch didnt resign, saved it half a point. Also, I remember Vincet Diepveen saying that he used to bet with people that he can mate them under 40 moves in that position and thats how he made money while he was in school.