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Subject: Re: How long does it take to your engine to find this move?

Author: Steven J. Brann

Date: 18:18:09 10/07/03

Go up one level in this thread


On October 07, 2003 at 19:18:34, Jaime Benito de Valle Ruiz wrote:

>[d]3r1r2/pb3pkp/1pn2Np1/2p1PP2/8/b2BQ3/qP4PP/3R1R1K w - - 0 3
>
>1.Nh5+ is a winning move, but the really smashing one is 1.Nxh7!

Chessmaster 9000 on a 3.0G P4 machine (default personality with SS=12 and 128M
of hash) sniffs Nxh7 after 2 seconds but then prefers Nh5+ with a 2.83 score
after 5:35.

After forcing Nxh7 black then responds with 3...Bc8 and a score in white's favor
of 2.23 -- thus CM9 thinks Nh5+ is better.  CM9k doesn't think Nxh7 is really
the "smashing one".

Time	Depth	Score	Positions	Moves
0:00	1/3	-2.09	3214		3.bxa3 Nxe5 4.Rd2
0:00	1/4	-1.87	15831		3.bxa3 Nxe5 4.Nh5+ Kg8 5.Nf6+ Kh8
					6.Be2 Qb2
0:00	1/5	-1.86	84616		3.bxa3 Nxe5 4.Nh5+ Kg8 5.Nf6+ Kh8
					6.Be4 Rxd1 7.Rxd1 Bxe4 8.Nxe4
0:00	1/5	-1.25	183158		3.Ng4 Kh8 4.fxg6 fxg6 5.Rxf8+ Rxf8
					6.bxa3 Qxa3
0:01	1/6	-1.25	241482		3.Ng4 Kh8 4.fxg6 fxg6 5.Rxf8+ Rxf8
					6.bxa3 Qxa3
0:02	1/6	-0.84	418679		3.Nxh7 Nd4 4.Qg5 Bxb2 5.fxg6 Bxg2+
					6.Qxg2
0:02	1/6	0.00	541169		3.Nh5+ Kh8 4.Qg5 gxh5 5.Qf6+ Kg8
					6.Qg5+ Kh8
0:02	1/7	0.00	626500		3.Nh5+ Kh8 4.Qg5 gxh5 5.Qf6+ Kg8
					6.Qg5+ Kh8
0:06	1/8	0.00	1576401		3.Nh5+ Kh8 4.Qg5 gxh5 5.Qf6+ Kg8
					6.Qg5+ Kh8
0:24	1/9	0.07	6333404		3.Nh5+ Kh8 4.Qh6 Rg8 5.fxg6 fxg6
					6.Bxg6 Rxg6 7.Rxd8+ Nxd8 8.Rf8+
					Qg8 9.Rxg8+ Kxg8 10.Nf6+ Rxf6 11.exf6

1:21	1/10	1.00	20866868	3.Nh5+ Kh8 4.Qh6 Rg8 5.fxg6 fxg6
					6.Bxg6 Rxg6 7.Rxd8+ Nxd8 8.Rf8+
					Qg8 9.Rxg8+ Kxg8 10.Nf6+ Kf7 11.Qxh7+
					Rg7 12.Qh5+ Ke6 13.bxa3 Bxg2+ 14.Kg1
5:37	2/11	2.83	88095444	3.Nh5+ Kh8 4.Qh6 Rg8 5.Nf6 Rg7
					6.Rf3 Qb3 7.Rdf1 Nxe5 8.Rh3 Bxg2+
					9.Kxg2 gxf5+ 10.Kh1 Qd5+ 11.Nxd5
					Rxd5 12.Rg1

black's reply after forcing 3.Nxh7

Time	Depth	Score	Positions	Moves
0:00	1/3	-3.61	2794		3...Kxh7 4.fxg6+ fxg6 5.Rxf8 Rxf8
					6.bxa3 Qxa3
0:00	1/4	-4.16	12648		3...Kxh7 4.Qh3+ Kg8 5.fxg6 fxg6
					6.Bxg6 Rxf1+ 7.Rxf1
0:00	1/5	1.39	48746		3...Kxh7 4.Qh3+ Kg8 5.fxg6 fxg6
					6.Bxg6 Rxf1+ 7.Rxf1 Rd7 8.Qxd7
0:00	1/5	1.27	54618		3...Qxb2 4.f6+ Kxh7 5.Qh3+ Kg8
					6.Qh6 Qxg2+ 7.Kxg2 Nd4+ 8.Kg1 Ne6
					9.Bxg6
0:00	1/5	-0.78	71130		3...Rh8 4.fxg6 fxg6 5.Qg5 Rxd3
					6.Rxd3 Qe6 7.bxa3 Rxh7
0:00	1/5	-0.87	191003		3...Nd4 4.Nxf8 Rxf8 5.fxg6 Bxb2
					6.Qg5
0:01	1/6	0.43	300671		3...Nd4 4.fxg6 c4 5.Nxf8 Rxf8 6.Be4
					Bxe4 7.Rxd4
0:04	1/6	-0.48	991848		3...Rxd3 4.Rxd3 Kxh7 5.Rxa3 Qxb2
					6.fxg6+ Kg7
0:04	1/7	-0.76	1049172		3...Rxd3 4.Rxd3 Kxh7 5.Rxa3 Qxb2
					6.fxg6+ Kg7 7.gxf7 Rxf7
0:07	1/8	-0.21	1602947		3...Rxd3 4.Rxd3 Kxh7 5.Rxa3 Qc4
					6.fxg6+ Kg8 7.gxf7+ Rxf7 8.Qg5+ Rg7
0:22	1/9	0.32	5461204		3...Rxd3 4.Qxd3 Rh8 5.fxg6 Nxe5
					6.Qxa3 Qxa3 7.bxa3 fxg6 8.Nf6 Rc8
					9.Kg1
1:33	1/10	3.77	24015307	3...Rxd3 4.Rxd3 Bc8 5.Rxa3 Qxb2
					6.fxg6 Be6 7.Nxf8 Bd5 8.Qg5 Kxf8
					9.gxf7 Bxf7
14:43	1/10	2.53	214004787	3...Bc8 4.Nxf8 Bxf5 5.Bxf5 Rxd1
					6.Rxd1 Bxb2 7.Nd7 a5 8.Bb1 Qa4
15:50	2/11	2.23	231977065	3...Bc8 4.Nxf8 Bxf5 5.Bxf5 Rxd1
					6.Rxd1 Bxb2 7.Nd7 Bd4 8.Qe4 Nb4
					9.Bg4

Steve



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