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Subject: Re: NN not always weaker then BB

Author: Uri Blass

Date: 07:56:54 09/06/02

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On September 06, 2002 at 07:23:15, Yuriy Lyapko wrote:

>Which chess engine will see that Rb1 is winning in this position?
>
>[D] b4bk1/p2p4/p1p1p2p/P1P1Pp1P/3P3p/2N4N/1r3PP1/4R1K1 w - -
>
>Best regards,
>George

Movei0076 can see a small advantage for white with Rb1(p850,32 Mbytes hash)
in less than 10 minutes.

I imagine that stronger engines can find it faster.

scores at the last iterations(from white point of view):



10 Rb1 -0.14
11 Rb1  0.01
12 Rb1 -0.10
12 Nf4  0.01
13 Nf4  0.03
14 Nf4  0.06
15 Nf4  0.09
15 Rb1  0.28
16 Rb1  0.38
17 Rb1  0.39
debug file of the last iterations

26690 <first : 11 1 1862 3196231 e1b1 b2b7 b1a1 b7b4 c3e2 f8e7 f2f3 g8f7 g1f2
b4b2 f2e3
32960 <first : 11 1 2489 4230954 e1b1 b2b7 b1a1 b7b4 c3e2 f8e7 f2f3 g8f7 g1f2
b4b2 f2e3
38720 <first : 12 -10 3065 5232932 e1b1 b2b7 b1a1 b7b4 c3e2 a8b7 h3f4 f8e7 g1f1
g8f7 f4d3 b4b3
43560 <first : 12 -9 3549 6069001 h3f4
59210 <first : 12 1 5114 8756674 h3f4 g8f7 f4g6 f8e7 g6e7 f7e7 e1b1 b2c2 b1b3
f5f4 c3e4 c2c1 g1h2 c1c2
67610 <first : 12 1 5954 10232964 h3f4 g8f7 f4g6 f8e7 g6e7 f7e7 e1b1 b2c2 b1b3
f5f4 c3e4 c2c1 g1h2 c1c2
92770 <first : 13 3 8470 14360321 h3f4 g8f7 f4g6 f8e7 g6e7 f7e7 e1b1 b2c2 b1b3
c2c1 g1h2 c1c2 f2f4 c2d2 b3b8
120180 <first : 13 3 11211 19117161 h3f4 g8f7 f4g6 f8e7 g6e7 f7e7 e1b1 b2c2 b1b3
c2c1 g1h2 c1c2 f2f4 c2d2 b3b8
194770 <first : 14 6 18670 31127474 h3f4 g8f7 f4g6 f8e7 g6e7 f7e7 e1b1 b2c2 b1b3
c2c1 g1h2 c1c2 h2h3 c2f2 b3b8 f2c2 b8a8 c2c3 h3h4
246560 <first : 14 6 23849 39600759 h3f4 g8f7 f4g6 f8e7 g6e7 f7e7 e1b1 b2c2 b1b3
c2c1 g1h2 c1c2 h2h3 c2f2 b3b8 f2c2 b8a8 c2c3 h3h4
519870 <first : 15 9 51180 84420162 h3f4 g8f7 f4g6 b2c2 e1b1 c2c3 b1b8 f8e7 b8a8
c3d3 a8a7 d3d4 g6e7 d4d1 g1h2 f7e7 a7a6
549200 <first : 15 10 54113 89629755 e1b1
598690 <first : 15 28 59062 98273594 e1b1 b2b7 b1b7 a8b7 c3d1 f8e7 d1e3 e7d8
e3c4 d8e7 g1f1 g8h7 f1e2 h7g7 h3f4 g7f7
636040 <first : 15 28 62797 104223230 e1b1 b2b7 b1b7 a8b7 c3d1 f8e7 d1e3 e7d8
e3c4 d8e7 g1f1 g8h7 f1e2 h7g7 h3f4 g7f7
703930 <first : 16 38 69586 116541501 e1b1 b2b7 b1b7 a8b7 c3d1 f8e7 d1e3 e7d8
e3c4 d8e7 g1f1 b7a8 h3f4 e7g5 f4g6 g8f7 c4d6 f7g7
746160 <first : 16 38 73809 123235257 e1b1 b2b7 b1b7 a8b7 c3d1 f8e7 d1e3 e7d8
e3c4 d8e7 g1f1 b7a8 h3f4 e7g5 f4g6 g8f7 c4d6 f7g7
909730 <first : 17 39 90166 152019119 e1b1 b2b7 b1b7 a8b7 c3d1 f8e7 d1e3 g8g7
g1f1 g7h8 f1e2 h8g8 e3c4 g8g7 e2d2 g7f7 d2d3 f7g7
1006450 <first : 17 39 99838 167881595 e1b1 b2b7 b1b7 a8b7 c3d1 f8e7 d1e3 g8g7
g1f1 g7h8 f1e2 h8g8 e3c4 g8g7 e2d2 g7f7 d2d3 f7g7

Uri



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