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Subject: Re: Mate in 12 ["Surrounded" by V. Albillo,1997]

Author: John Merlino

Date: 10:55:40 01/09/02

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On January 09, 2002 at 10:41:05, José Antônio Fabiano Mendes wrote:

>       Mate in 12 by V. Albillo,1997
>       [D]rnbQKbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBqkBNR w
>       Source ==> http://www.multimania.com/albillo/ajedre9a.htm

That page's data is very old, speaking in terms of computer hardware and chess
engine enhancements -- almost five years.

CM8000 finds Mate in 12 in 8:28 on my PIII-600. That's over 250 times faster
than Chest did almost five years ago on a P-166!

Time	Depth	Score	Positions	Moves
0:00	1/3	4.01	5306		1.Nf3+ Kxf2 2.Ne5 Qxf1 3.Rxf1+
					Kxf1 4.Qxc8 Nc6
0:00	1/4	4.85	36832		1.Nf3+ Kxf2 2.Qxc7 Nf6+ 3.Kxf7
					d6 4.Qc3 Be6+ 5.Kxe6
0:01	2/5	4.39	112317		1.Nf3+ Kxf2 2.Qxc7 d6 3.Qc4 Bd7+
					4.Kxf8 Nh6+ 5.Kxg7 Nf5+ 6.Kxh8
					Be6 7.Qc3 Nd7+ 8.Kxh7 Nf6+ 9.Qxf6
					exf6
0:04	2/6	4.39	309222		1.Nf3+ Kxf2 2.Qxc7 d6 3.Qc4 Bd7+
					4.Kxf8 Nh6+ 5.Kxg7 Nf5+ 6.Kxh8
					Be6 7.Qc3 Nd7+ 8.Kxh7 Nf6+ 9.Qxf6
					exf6
0:20	3/7	3.34	1538948		1.Nf3+ Kxf2 2.Qxc7 d6 3.Qxc8 Nc6
					4.Qxa8 Nf6+ 5.Kxf7 Qxc2 6.d3 Qxc1
					7.b4 Qh6
0:33	3/7	3.66	2373180		1.Qxc7 d6 2.Qxc8 Na6 3.Qxa8 Nc7+
					4.Kxf8 Nf6+ 5.Kxe7 Rxa8 6.Nc3 Qxc2
					7.Kxd6 Kxf1 8.Kxc7
0:51	3/7	6.01	3733088		1.Nc3 Nf6+ 2.Kxf7 Qxc2 3.d3 Kxf1
					4.Nh3+ Kxg2 5.Bg5 Kxh3 6.Qxc7 Qxd3
					7.exd3 e5 8.Bxf6
1:19	3/8	Mate14	6061187		1.Nc3 Nf6+ 2.Kxf7 Qxc2 3.d3 Kxf1
					4.Nf3+ Kxg2 5.Qxc7 d6 6.Rg1+ Kxf2
					7.Be3+ Kxe3 8.Nd5+ Nxd5 9.Qxc2
					Be6+ 10.Kxe6 Nf4+ 11.Kf7 Nxd3 12.Qxd3+
					Kf4 13.Qd4+ Kf5 14.Qg4#
1:54	4/9	Mate13	9343548		1.Nc3 Nf6+ 2.Kxf7 Kxf1 3.Nf3+ Kxg2
					4.Rxd1 c5 5.Rg1+ Kxf2 6.Nd1+ Kxe2
					7.Nd4+ cxd4 8.Qa5 Nd5 9.Qb5+ Kf3
					10.Qxd5+ Kf4 11.Rf1+ Kg4 12.Qf5+
					Kh4 13.Rf4#
3:32	4/10	Mate13	18219294	1.Nc3 Nf6+ 2.Kxf7 Kxf1 3.Nf3+ Kxg2
					4.Rxd1 Nc6 5.Rg1+ Kxf2 6.Nd1+ Kxe2
					7.Nd4+ Nxd4 8.Qxc7 Ne4 9.Nc3+ Kf2
					10.Nxe4+ Kf3 11.Rf1+ Kxe4 12.d3+
					Kd5 13.c4#
8:28	5/11	Mate12	46218752	1.Nc3 Nf6+ 2.Kxf7 Kxf1 3.Nf3+ Kxg2
					4.Rxd1 Nc6 5.Rg1+ Kxf2 6.Nd1+ Kxe2
					7.Nd4+ Nxd4 8.Qxc7 Ne4 9.Qc4+ Kf3
					10.Qf1+ Nf2 11.d3 Nxc2 12.Qxf2#

jm



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