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Subject: Re: 0.05 seconds using PN search...

Author: Vincent Diepeveen

Date: 08:05:38 04/24/01

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On April 22, 2001 at 23:40:02, Paul Byrne wrote:

>On April 22, 2001 at 09:57:10, leonid wrote:
>
>>Hi!
>>
>>If you want to solve one mate and say your result, then this is the position:
>>
>>[D]2R2bNn/Rp1n1k1b/1q1ppB1p/1Np1p1p1/2P1P2P/3P2PB/4Q2K/8 w - -
>>
>>If you program says nodes/per/second, please indicate it for this position.
>
>1W. i=448 n=8398 p=0 d=1000000000 t=0.050
>1W. Bxe6 wins!

>PN search is typically quite effective on positions like this.  8398 nodes.
>My own program G2K on a 1.2 GHz athlon.

Very good!

don't watch search times btw, my pentiumpro 200 internet computer
was swapping quite a bit. diep needs 620k nodes to show a mate score.
fail high of course less nodes, but that's not interesting here.

That's about 8 seconds on a dual.
Amazing PN beats it in this position. Must figure out why DIEP needs
so many plies to find this mate looks pretty easy to me to see in qsearch.

Perhaps a bug in qsearch code somewhere :)

00:30 0 29502 (0) 2 15.67 Qe2-f2 Kf7-g6 Bh3-f5 e6xf5 Qf2xf5 Kg6-h5 Qf5xd7
++ h3-e6
00:31 0 31731 (0) 2 16.32 Bh3xe6 Kf7xe6 Qe2-g4 Ke6-f7 Bf6-d8
++ e2-f3
00:44 0 127707 (0) 2 17.01 Qe2-f3 g5-g4 Qf3xg4 Bh7-f5 e4xf5 Nd7xf6 Ng8xf6 Kf7xf6
 Rc8xf8 Nh8-f7
00:47 2 146273 (0) 3 17.86 Qe2-f3 Bh7-f5 Bf6-d8 Kf7xg8 e4xf5
++ e2-f2
01:17 5 326122 (0) 3 17.87 Qe2-f2 Bh7-f5 Bf6-d8 Kf7xg8 e4xf5
01:30 85 388791 (0) 4 18.10 Qe2-f2 Bh7-f5 Bf6-d8 Kf7xg8 e4xf5 Qb6xa7 Nb5xa7 g5xh
4 g3xh4
++ e2-f3
01:34 125 401982 (0) 4 18.18 Qe2-f3 Bh7-f5 Bf6-d8 Kf7xg8 e4xf5 Qb6xa7 Nb5xa7
++ h3-e6
01:42 204 475088 (0) 4 21.97 Bh3xe6 Kf7xe6 Qe2-g4 Ke6-f7 Qg4xd7 Kf7-g6 Ra7xb7 Qb
6xb7 Qd7xb7 Bh7xg8 Rc8xf8 g5xh4
01:56 524 621360 (0) 5 MATE08 Bh3xe6 Kf7xe6 Qe2-g4 Ke6-f7 Qg4xd7 Kf7-g6 Qd7-f5 K
g6-h5 g3-g4 Kh5xh4 Bf6xg5 h6xg5 Qf5-f2 Kh4xg4 Ng8-f6
02:11 1775 933805 (0) 6 MATE07 Bh3xe6 Kf7xe6 Qe2-g4 Ke6-f7 Qg4xd7 Kf7-g6 Qd7-f5
Kg6-h5 g3-g4 Kh5xh4
02:37 6156 1501442 (0) 7 MATE07 Bh3xe6 Kf7xe6 Qe2-g4 Ke6-f7 Qg4xd7 Kf7-g6 Qd7-f5
 Kg6-h5 g3-g4 Kh5xh4
04:10 22594 3579646 (0) 8 MATE07 Bh3xe6 Kf7xe6 Qe2-g4 Ke6-f7 Qg4xd7 Kf7-g6 Qd7-f
5 Kg6-h5 g3-g4 Kh5xh4



>-paul



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