Interesting ICC game

[jdart]

At this point:

[d] r1b1k1r1/2q1bpPp/p3pn1R/6Q1/1p2p3/1NN2P2/PPP3P1/1K1R1B2 w q -

Arasan played Nb5 with a large plus score. But it appears on deeper analysis that this move only draws, while Bb5+ would win.

Game with some annotations follows:

[Event "chessclub.com"]
[Site "chessclub.com"]
[Date "2009.01.04"]
[Round "?"]
[White "Arasan 11.3"]
[Black "Telepath"]
[Result "1/2-1/2"]
[ECO "B48"]
[WhiteElo "2527"]
[BlackElo "2428"]
[PlyCount "207"]
[EventDate "2009.??.??"]
[TimeControl "300+4"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 a6 7. Qd2 Nf6 8.
O-O-O Bb4 9. f3 Ne5 10. Nb3 Ng6 11. h4 d5 12. h5 Ne7 13. h6 Rg8 14. Bg5 dxe4
15. hxg7 Ned5 16. Bxf6 Nxf6 17. Qg5 Be7 18. Kb1 b5 19. Rh6 b4 20. Nb5 (20. Bb5+
$142 axb5 21. Nxb5 Qb8 (21... Qc6 22. N3d4 $18) 22. Rxf6 e3 23. N3d4 $18) 20...
axb5 21. Bxb5+ Bd7 22. Bxd7+ Nxd7 23. Rxe6 fxe6 24. Qh5+ $11 Kd8 25. Qxh7 Qa7
26. Qxg8+ Kc7 27. Qf7 Qxa2+ 28. Kc1 e3 29. Qf4+ e5 30. Qxe3 Qa6 31. f4 Qg6 32.
Kb1 Qxg7 33. Qe4 Nb6 34. Rh1 Rh8 35. Rg1 Rd8 36. fxe5 Qf7 37. e6 Qf6 38. Re1
Na4 39. c3 Rd6 40. Nd4 Qf2 41. Qe2 Qxe2 42. Rxe2 Kd8 43. Nf5 Rd5 44. Nxe7 Kxe7
45. cxb4 Rg5 46. Ka2 Nb6 47. Ka3 Nd5 48. Kb3 Nf4 49. Re4 Rg3+ 50. Kc4 Nxe6 51.
b5 Rxg2 52. b6 Rxb2 53. b7 Rxb7 54. Kd5 Rb5+ 55. Kc6 Rc5+ 56. Kb7 Kd6 57. Rb4
Kd5 58. Kb8 Nd4 59. Rb7 Nc6+ 60. Kc8 Ne5+ 61. Kb8 Rc1 62. Rb5+ Kd6 63. Rb6+ Kc5
64. Rb7 Rh1 65. Rc7+ Kd6 66. Rg7 Rb1+ 67. Rb7 Nc6+ 68. Kc8 Ne7+ 69. Kb8 Rh1 70.
Rb6+ Kc5 71. Re6 Nc6+ 72. Kc8 Rh7 73. Re3 Ne7+ 74. Kb8 Kd6 75. Rd3+ Nd5 76. Rg3
Ke6 77. Rg6+ Ke5 78. Rg5+ Ke4 79. Rg4+ Kf5 80. Rg8 Kf6 81. Rf8+ Ke6 82. Re8+
Kd6 83. Rg8 Ne7 84. Rd8+ Kc6 85. Rd3 Nd5 86. Rg3 Rb7+ 87. Kc8 Ne7+ 88. Kd8 Kd6
89. Rd3+ Nd5 90. Ke8 Ke6 91. Kf8 Rf7+ 92. Ke8 Re7+ 93. Kf8 Ra7 94. Rg3 Rf7+ 95.
Ke8 Nf6+ 96. Kd8 Kd6 97. Rd3+ Nd5 98. Ke8 Rg7 99. Rd4 Kc6 100. Rc4+ Kb6 101.
Rh4 Rg6 102. Re4 Kc5 103. Rh4 Nf6+ 104. Kd8 1/2-1/2

[CRoberson]

I liked that game to. Watched it play and was a bit concerned for a
while.

Tried single proc Toga and Rybka 2.3.2a mp on my core 2 duo
laptop. Rybka took almost 6 minutes and Toga took 14 minutes.
I guess that is the secret to computer chess: make moves just good
enough to require your opponent to take way too long to calculate it.

Here are Toga and Rybka analysis.

FEN: r1b1k1r1/2q1bpPp/p3pn1R/6Q1/1p2p3/1NN2P2/PPP3P1/1K1R1B2 w q - 0 1

Rybka 2.3.2a mp 32-bit:
5 00:00 4.367 69.872 +0.48 Nc3b5 a6xb5
6 00:00 6.896 74.331 +0.53 Nc3b5 a6xb5 Rh6xf6 Be7xf6 Qg5xf6 Bc8d7
6 00:00 35.789 86.638 +0.72 Bf1b5+ a6xb5 Nc3xb5 Qc7b6 Qg5e5 Rg8xg7
7 00:00 70.500 100.266 +0.59 Bf1b5+ a6xb5 Nc3xb5 Qc7b8 Rh6xf6 e4e3 c2c4
8 00:01 87.003 105.433 +0.93 Bf1b5+ a6xb5 Nc3xb5 Qc7b8 Rh6xf6 e4e3 c2c4 e3e2 Rd1e1
9 00:01 141.797 111.864 +0.43 Bf1b5+ a6xb5 Nc3xb5 Qc7b8 Rh6xf6 e4e3 Nb3d4 Ra8a6 Qg5h6
9 00:01 200.701 115.265 +1.00 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4
10 00:02 226.219 116.640 +0.85 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4
11 00:02 285.219 119.747 +0.87 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4 Rd1c1
12 00:03 400.905 123.281 +0.87 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4 Rd1c1 Be7xf6 Qg5xf6 Qc7d6
13 00:05 658.431 127.623 +0.86 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4 Rd1xd8+ Qc7xd8 Qg5f4+ Kb8a7
14 00:09 1.186.614 129.803 +0.97 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4 Rd1d3 Be7xf6 Qg5xf6 Ba4xb3
15 00:19 2.525.550 131.037 +0.83 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4 Rd1xd8+ Qc7xd8 Qg5f4+ Kb8a7
16 00:39 5.120.687 134.768 +0.83 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Bd7a4 Rd1xd8+ Qc7xd8 Qg5f4+ Kb8a7
17 01:18 10.406.898 136.129 +0.81 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5a6+ Kc8b8 f3xe4 Be7xf6 Qg5xf6 Bd7a4 Rd1d4 Rd8xd4
17 05:48 41.465.044 121.945 +1.44 Bf1b5+ a6xb5 Nc3xb5 Qc7b6 Qg5e5 Rg8xg7 Nb5c7+ Ke8f8 Nc7xa8 Qb6f2 Qe5c7 Rg7xg2 Qc7xc8+ Kf8g7
18 07:52 56.561.639 122.730 +1.53 Bf1b5+ a6xb5 Nc3xb5 Qc7b6 Qg5e5 Rg8xg7 Nb5c7+ Ke8f8 Nc7xa8 Qb6f2 Qe5c7 Rg7xg2 Qc7xc8+ Kf8g7
19 11:20 82.843.361 124.623 +1.59 Bf1b5+ a6xb5 Nc3xb5 Qc7b6 Qg5e5 Rg8xg7 Nb5c7+ Ke8f8 Nc7xa8 Qb6f2 Qe5c7 Rg7xg2 Qc7xc8+ Kf8g7


Now Toga.
FEN: r1b1k1r1/2q1bpPp/p3pn1R/6Q1/1p2p3/1NN2P2/PPP3P1/1K1R1B2 w q - 0 1

Toga II 1.4.1SE:
1/10 00:00 165 0 +0.98 Rh6xf6 Be7xf6 Qg5xf6 b4xc3
1/14 00:00 1.769 0 +1.99 Nc3e2
1/14 00:00 1.777 0 +2.11 Nc3a4
2/14 00:00 2.669 0 +1.52 Nc3a4 Nf6d5
3/14 00:00 3.621 0 +0.47 Nc3a4 Bc8d7 Rh6xf6 Be7xf6 Qg5xf6 Bd7xa4 f3xe4 Ba4xb3 a2xb3
3/14 00:00 4.165 0 +0.72 Nc3e2 Nf6d5 Qg5g4
4/14 00:00 5.090 0 +0.76 Nc3e2 Nf6d5 Qg5g4 e4xf3 g2xf3
5/16 00:00 8.447 0 +0.26 Nc3e2 Nf6d5 Qg5g3 Qc7xg3 Ne2xg3 Rg8xg7 Ng3xe4
6/18 00:00 18.462 0 +0.57 Nc3e2 Nf6d5 Qg5g4 Nd5e3 Qg4xe4 Ne3xd1 Qe4xh7 Rg8xg7 Qh7xg7
7/19 00:00 34.842 0 +0.24 Nc3e2 Nf6d5 Qg5g4 e4xf3 Ne2d4 Qc7f4 Qg4xf4 Nd5xf4
7/23 00:00 51.973 0 +0.57 Nc3b5 a6xb5 Rh6xf6 Be7xf6 Qg5xf6 Bc8d7 f3xe4 Qc7a7 Nb3c1
8/23 00:00 70.696 0 +0.24 Nc3b5 a6xb5 Rh6xf6 Be7xf6 Qg5xf6 Bc8d7 f3xe4 Qc7a7 Qf6e5 Qa7xa2+ Kb1c1 Qa2a4
9/44 00:01 693.262 0 +1.05 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 Qg5a5 Qd7d1+ Nb3c1 Rg8xg7 Qa5a8+ Kc8d7 Qa8b7+ Kd7e8 Qb7b8+ Qd1d8
10/44 00:01 938.342 750.000 +0.30 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 f3xe4 Qd7d1+ Nb3c1 Be7xf6 Qg5xf6 Qd1g4 Qf6xf7 Rg8xg7 Qf7f8+ Kc8c7 Qf8xb4 Qg4xg2
11/44 00:02 1.325.685 720.615 +0.34 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 Qg5f4 Be7xf6 Qf4xf6 e4e3 Nb3d4 h7h6 Qf6e5
12/44 00:03 2.106.122 711.421 +0.32 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 f3xe4 Qd7d1+ Nb3c1 Be7xf6 Qg5xf6 Qd1g4 Qf6xf7 Rg8xg7 Qf7f8+ Kc8c7 Qf8xb4 Qg4xg2 Qb4c5+ Kc7b7
13/58 00:06 4.449.062 713.098 +0.53 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Bb5xd7+ Nf6xd7 Rh6xe6 f7xe6 Qg5h5+ Ke8d8 Qh5xh7 Qc7a7 Qh7xg8+ Kd8c7 Qg8f7 Qa7xa2+ Kb1c1 e4e3 Qf7f4+ e6e5 Qf4xe3 Be7f6 Qe3h6 Qa2a7 g2g3 Qa7f2
14/58 00:10 7.350.240 707.867 +0.49 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Bb5xd7+ Nf6xd7 Rh6xe6 f7xe6 Qg5h5+ Ke8d8 Qh5xh7 Qc7a7 Qh7xg8+ Kd8c7 Qg8f7 Qa7xa2+ Kb1c1 e4e3 Qf7f4+ e6e5 Qf4xe3 Be7f6 Qe3h6 Qa2a7 Qh6g6 Qa7e3+ Kc1b1 Qe3e2
15/58 00:24 16.811.214 708.203 +0.43 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 f3xe4 Qd7d1+ Nb3c1 Be7xf6 Qg5xf6 Qd1g4 Qf6xf7 Rg8xg7 Qf7f8+ Kc8c7 Qf8xb4 Qg4xg2 Qb4c5+ Kc7d7 Qc5a7+ Kd7e8 Qa7b8+ Ke8e7 Qb8c7+ Ke7e8
16/58 00:48 34.303.013 711.638 +0.40 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 f3xe4 Qd7d1+ Nb3c1 Be7xf6 Qg5xf6 Qd1g4 Qf6xf7 Rg8xg7 Qf7f8+ Kc8c7 Qf8xb4 Qg4xg2 Qb4c5+ Kc7b7 Qc5b5+ Kb7c7 Qb5e5+ Kc7d7 c2c4 Rg7g5 Qe5d4+ Kd7c6
17/58 01:38 70.355.973 712.726 +0.48 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 f3xe4 Qd7d1+ Nb3c1 Be7xf6 Qg5xf6 Qd1g4 Qf6xf7 Rg8xg7 Qf7f8+ Kc8d7 Qf8xb4 Qg4xg2 a2a4 Rg7g4 Nc1d3 Qg2f1+ Kb1a2 Rg4g2 Nd3c5+ Kd7c6 Nc5xe6 Rg2xc2
18/58 03:23 145.223.811 714.507 +0.59 Nc3b5 a6xb5 Bf1xb5+ Bc8d7 Rh6xf6 000 Bb5xd7+ Rd8xd7 Rd1xd7 Qc7xd7 f3xe4 Qd7d1+ Nb3c1 Be7xf6 Qg5xf6 b4b3 a2xb3 Qd1g4 Qf6xf7 Rg8xg7 Qf7f8+ Kc8b7 Qf8b4+ Kb7a8 Qb4a5+ Rg7a7 Qa5d8+ Ka8b7 Qd8d7+ Kb7b6 Qd7d6+ Kb6b7 Qd6b4+ Kb7a8 Qb4f8+ Ka8b7 Qf8e7+ Kb7b6
18/67 14:34 608.960.460 696.616 +2.19 Bf1b5+ a6xb5 Nc3xb5 Qc7c6 Nb3d4 Qc6c4 b2b3 Qc4c5 Qg5xc5 Be7xc5 Nb5c7+ Ke8d7 Nc7xa8 Nf6d5 Nd4xe6 f7xe6 f3xe4 Bc5e3 Rh6h3 Be3f4 e4xd5 Rg8xg7
19/68 22:35 949.208.277 700.430 +2.29 Bf1b5+ a6xb5 Nc3xb5 Qc7b7 Rh6xf6 Bc8d7 Nb5d6+ Be7xd6 Rd1xd6 Qb7c7 Rd6d2 Qc7a7 Nb3c1 e4xf3 g2xf3 Bd7c6 Rd2e2 000 Nc1d3 Rd8d5 Qg5g3 h7h5 Re2d2
20/68 45:23 1.904.704.796 699.462 +2.49 Bf1b5+ a6xb5 Nc3xb5 Qc7b6 Qg5e5 Rg8xg7 Nb5c7+ Ke8f8 Nc7xa8 Qb6c6 Rh6xf6 Rg7xg2 Nb3d4 Qc6c5 Qe5xc5 Be7xc5 Nd4f5 e6xf5 Rf6c6 Bc8b7 Rc6xc5 e4e3 Na8c7 Bb7xf3 Rd1e1 Rg2d2 Rc5xf5 Bf3e4 Rf5c5 e3e2 Kb1c1