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Subject: Re: Test position, Bxh6 Sac

Author: John Merlino

Date: 13:02:12 05/03/05

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On May 03, 2005 at 13:24:08, Jarkko Pesonen wrote:

>[D]1r3r1k/2q1bpp1/4b2p/p3P3/1p1p4/3BB1QP/PPP2RP1/1K3R2 w - - 0 24
>
>How fast are you?

Eleven seconds for CM9_R1 on an AMD 2500:

Time	Depth	Score	Positions	Moves
0:00	1/3	1.43	1590		24.Bxd4 Bg5 25.Re2 Rfd8
0:00	1/4	1.45	4552		24.Bxd4 Rbd8 25.Qe3 Bg5
0:00	1/5	1.27	18396		24.Bxd4 Rbd8 25.Be3 Rd5 26.Re2 Qxe5
0:01	1/6	1.32	69745		24.Bxd4 Bc5 25.Qe3 Bxd4 26.Qxd4
					Rfd8 27.Qe4
0:01	1/7	1.26	166646		24.Bxd4 Rbd8 25.Qe3 Qc6 26.Bb6
					Bg5 27.Qe4 Qxe4 28.Bxe4
0:04	1/8	1.31	751833		24.Bxd4 Qd7 25.Qe3 Qd5 26.b3 Rfd8
					27.Bb2 Qc6
0:11	1/8	5.45	2718992		24.Bxh6 g6 25.Bxg6 Rbc8 26.Bxf8
					Rxf8 27.Bxf7 Qc4 28.b3
0:16	1/9	6.02	4227789		24.Bxh6 g6 25.Bxg6 a4 26.Bxf8 Rxf8
					27.Bxf7 Qc4 28.b3 Qb5 29.c4
0:47	1/10	6.51	13086441	24.Bxh6 g6 25.Bxg6 f5 26.Bxf8 Rxf8
					27.Bxf5 Rg8 28.Qf4 Bg5 29.Qxd4 Rd8

Note that if Black responds with 24...gxh6, The King needs only 14 seconds to
report a Mate in 13, which it then quickly reduces to a Mate in 11:

Time	Depth	Score	Positions	Moves
0:00	1/3	-1.69	2081		25.Qf4 Bg5 26.Qxd4 Rfd8
0:00	1/4	-0.94	6967		25.Qf4 Bg5 26.Qe4 f6 27.exf6
0:00	1/5	-0.22	19888		25.Qf4 Bg5 26.Qe4 f6 27.exf6 Qf7
					28.Qxd4 Bxa2+ 29.Ka1
0:00	1/5	0.27	43647		25.Rf6 Bxf6 26.Rxf6 Bxa2+ 27.Kxa2
					b3+ 28.cxb3 Qc1 29.Qg4
0:00	1/6	1.29	78651		25.Rf6 Bxf6 26.Rxf6 Bxa2+ 27.Kxa2
					Rb6 28.Qf4 Rxf6 29.Qxf6+ Kg8 30.Qxh6
					Re8
0:02	1/7	14.33	612675		25.Rf6 Bxf6 26.Rxf6 Bxa2+ 27.Kxa2
					Rb6 28.Qh4 Kg8 29.Qxh6 Qc4+ 30.Bxc4
					Rxf6 31.Qxf6 a4 32.Qg6+ Kh8 33.Bxf7
0:07	1/8	18.99	2248010		25.Rf6 Bxa2+ 26.Kxa2 b3+ 27.Ka1
					Qc6 28.Rxc6 Bg5 29.e6 f5 30.e7
					f4 31.exf8=Q+ Rxf8 32.Qe1 Bf6 33.Rxf4

0:14	1/9	Mate13	4911333		25.Rf6 Bxa2+ 26.Kxa2 Rb6 27.Qh4
					Kg8 28.Qxh6 Qc4+ 29.Bxc4 b3+ 30.Bxb3
					a4 31.Rg6+ Rxg6 32.Qxg6+ Kh8 33.Bxf7
					Bg5 34.Qh5+ Kg7 35.Qxg5+ Kh7 36.Qg6+
					Kh8 37.Qh6#
0:19	1/10	Mate11	6845563		25.Rf6 Bxa2+ 26.Kxa2 Bxf6 27.Rxf6
					Rb6 28.Qh4 Kg8 29.Qxh6 b3+ 30.cxb3
					Re8 31.Bh7+ Kh8 32.Bg6+ Kg8 33.Qh7+
					Kf8 34.Rxf7+ Qxf7 35.Qxf7#
0:26	1/11	Mate11	9849431		25.Rf6 Bxa2+ 26.Kxa2 Bxf6 27.Rxf6
					Rb6 28.Qh4 Kg8 29.Qxh6 b3+ 30.cxb3
					Re8 31.Bh7+ Kh8 32.Bg6+ Kg8 33.Qh7+
					Kf8 34.Rxf7+ Qxf7 35.Qxf7#
0:42	1/12	Mate11	16465027	25.Rf6 Bxa2+ 26.Kxa2 Bxf6 27.Rxf6
					Rb6 28.Qh4 Kg8 29.Qxh6 b3+ 30.cxb3
					Re8 31.Bh7+ Kh8 32.Bg6+ Kg8 33.Qh7+
					Kf8 34.Rxf7+ Qxf7 35.Qxf7#

jm



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