Author: Tord Romstad
Date: 04:32:17 10/24/03
Go up one level in this thread
On October 23, 2003 at 16:28:03, Darren Rushton wrote:
>[D] 8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1
>
>1...Rxb2!! 2.Nxb2 c3 3.Rxb6 (or 3.Nd3 c4+ 4.Rxb6 cxd3 etc.) 3...c4! This move,
>and the next, are not obvious at all. 4.Rb4 a5! (The crux of the combination
>and, as Sanz later said, the most difficult move to find) 5.Nxc4 c2 and black
>won in a few more moves.
>
>So does Fritzy find 1...Rxb2!! (very likely) but more importantly,
>3...c4!
>and 4...a5!
>
>let's see.
I don't know why, but this particular position has always been extremely
difficult for my engine. The latest version (running on a PIV 2.4 GHz)
finally finds the win after 4:09 at ply 14:
1 0.16 0.00 136 d2d1 g1f2
2 0.12 0.00 415 d2d1 g1f2 d1b1
3 0.00 0.01 1950 d2d1 g1f2 d1d2 f2f1 d2d1 f1f2
4 0.06 0.08 9126 h7g6 h2h3 d2d1 g1h2 d1d6 a4b6
5 -0.02 0.19 31233 h7g6 g2g4 d2d6 a4b6 a7b6
6 >= -0.02 0.22 35468 h7g6 g2g4 d2d6 a4b6 d6b6
6 <= -0.02 0.39 76383 h7g6 h2h3 d2d6 g1h2 g6f6 a4c3
6 -0.02 0.40 76383 h7g6 h2h3 d2d6 g1h2 g6f6 a4c3
7 <= -0.03 0.84 204232 h7g6 g2g4 g6h7 h2h3 d2d1 g1f2 d1b1 f2f3
7 <= -0.05 0.95 240106 h7g6 g2g4 g6h7 h2h3 d2d1 g1f2 d1b1 f2f3
7 >= -0.06 1.01 254215 h7g6 g2g4 g6h7 h2h3 d2d6 a4b6 a7b6
7 >= -0.05 1.04 261963 h7g6 g2g4 g6h6 h2h3 d2d6 a4b6 a7b6
7 -0.05 1.05 261963 h7g6 g2g4 g6h6 h2h3 d2d6 a4b6 a7b6
8 >= -0.02 1.22 314532 d2b2 a4b2 c4c3 b2d3 c5c4 b7b6 a7b6 d3f2
c3c2
8 >= 0.00 1.23 314619 d2b2 a4b2 c4c3 b2d3 c5c4 b7b6 a7b6 d3f2
c3c2
8 <= 0.05 1.68 449542 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3
8 <= 0.03 1.73 468340 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3
8 >= 0.02 1.74 468641 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3
8 >= 0.03 1.74 468757 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3
8 0.03 1.75 468757 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3
9 >= 0.03 1.81 487900 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 h7g6 g1f2
g6f6
9 >= 0.05 1.83 488642 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 h7g6 g1f2
g6f6
9 >= 0.11 1.85 491355 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 h7g6 g1f2
g6f5
9 >= 0.25 1.88 499491 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3f2
c3c2
9 >= 0.50 1.96 520777 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 <= 0.88 2.24 602248 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 <= 0.86 2.26 605866 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 <= 0.83 2.28 610125 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 <= 0.75 2.32 617585 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 <= 0.59 2.39 638054 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 <= 0.50 2.61 704889 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
9 0.50 2.63 704889 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
10 <= 0.48 3.81 1074561 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
10 >= 0.48 3.99 1131608 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
10 0.48 4.00 1131608 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
11 >= 0.48 4.28 1227567 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 g1f2
11 <= 0.48 7.99 2332018 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 a2a4
11 0.48 8.00 2332018 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 a2a4
12 <= 0.47 18.66 4995775 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 a2a4
12 <= 0.45 19.81 5415981 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 a2a4
12 <= 0.42 30.42 8799217 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 a2a4
12 <= 0.34 34.50 10183876 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
g7g5 a2a4
12 >= 0.20 34.80 10295311 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
b6b5 b4c2
12 >= 0.22 34.83 10302170 d2b2 a4b2 c4c3 b7b6 a7b6 b2d3 c5c4 d3b4
b6b5 b4c2
12 >= 0.28 46.09 13778529 b6d8 g1f1 d8f6 h2h3 f6d4 g2g3 d2f2 f1e1
f2g2 b7a7 d4b2 e1f1 g2h2 a4b2
12 <= 0.33 47.28 14194062 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 d2f2 f1e1
f2h2 b7a7 d4b2 a4c5 b2c3 e1d1
12 <= 0.31 47.80 14404233 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 d2f2 f1e1
f2h2 b7a7 d4b2 a4c5 b2c3 e1d1
12 >= 0.30 50.70 15271638 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 d2f2 f1e1
f2h2 b7a7 d4b2 a4c5 b2c3
12 <= 0.30 51.50 15567667 b6d8 g1f1 d8f6 h2h3 f6d4 g2g3 d2f2 f1e1
f2g2 b7a7 g2g3 a4b6 d4b2
12 0.30 51.52 15567667 b6d8 g1f1 d8f6 h2h3 f6d4 g2g3 d2f2 f1e1
f2g2 b7a7 g2g3 a4b6 d4b2
13 <= 0.28 1:26 26317280 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 d2f2 f1e1
f2h2 b7a7 d4b2 a4b2 h2b2 a7c7
13 <= 0.27 1:43 31140483 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 d2f2 f1e1
f2h2 b7a7 d4b2 a4b2 h2b2 a7c7
13 >= 0.25 2:01 36514035 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 a7a6 b7b6
a6a5 b6b5 d2d1 f1e2 d1a1 a2a3
13 >= 0.27 2:06 38095815 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 a7a6 b7b6
a6a5 b6b5 d2d1 f1e2 d1a1 a2a3
13 0.27 2:06 38095815 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 a7a6 b7b6
a6a5 b6b5 d2d1 f1e2 d1a1 a2a3
14 >= 0.27 3:10 54916085 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 a7a6 b7b6
d2f2 f1e1 f2h2 b6a6
14 >= 0.28 3:47 65576760 b6d8 g1f1 d8f6 h2h3 f6d4 g2g4 a7a6 b7b6
d2f2 f1e1 f2h2 b6a6
14 >= 0.34 4:09 72513875 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b2d3
c4d3 b4h4 h7g8
14 >= 0.48 4:12 73601441 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b2d3
c4d3 b4h4 h7g8
14 >= 0.73 4:16 74913983 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b2d3
c4d3 b4h4 h7g8
14 >= 1.12 4:23 77248329 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b2d3
c4d3 b4h4 h7g8
14 <= 1.67 4:41 82106856 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b7
14 <= 1.66 4:44 83201186 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b7
14 <= 1.62 4:46 83931792 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b7
14 <= 1.55 4:49 85177338 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b7
14 <= 1.39 4:55 87195522 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 h7h6
14 >= 1.14 4:58 87900079 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 >= 1.16 4:58 88174696 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 >= 1.22 5:02 89325938 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 <= 1.34 5:09 91178512 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 <= 1.33 5:11 91964764 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 >= 1.31 5:17 93890571 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 >= 1.33 5:18 94427677 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
14 1.33 5:18 94427677 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5
c3c2 g1f2 c2c1Q f2e2 c4c3 b5h5 h7g6
Tord
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