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Subject: Re: Mate in 12

Author: John Merlino

Date: 10:59:15 07/06/02

Go up one level in this thread

On July 06, 2002 at 09:47:59, Art Basham wrote:

>Qh6 mates in 12..!
>
>[D]1b4k1/r4p2/5Pp1/8/8/8/8/2Q4K w - -
>
>CM5500 takes 8 ply to find it.
>
>Fritz7 says that Qc8+ also mates!

Chessmaster 9000 announces Mate in 12 in about 1/2 second on a PIII-733:

Time	Depth	Score	Positions	Moves
0:00	1/3	6.01	3733		1.Qc8+ Kh7 2.Qf8 Ra1+ 3.Kg2 Rg1+
					4.Kxg1 Ba7+ 5.Kg2
0:00	2/4	9.20	12213		1.Qc8+ Kh7 2.Qf8 Ra1+ 3.Kg2 Ra2+
					4.Kf3 Ra3+ 5.Ke4 Ra4+ 6.Kd5 Ra5+
					7.Kc4 Ra4+ 8.Kb3 Ra3+ 9.Kxa3 Bd6+
					10.Qxd6 g5
0:00	3/5	Mate13	21664		1.Qc8+ Kh7 2.Qf8 Ra1+ 3.Kg2 Ra2+
					4.Kf3 Ra3+ 5.Ke4 Ra4+ 6.Kd5 Ra5+
					7.Kc4 Ra4+ 8.Kb5 Rb4+ 9.Kc6 Rc4+
					10.Kd5 Rc5+ 11.Kxc5 Ba7+ 12.Kc4
					g5 13.Qg7#
0:00	3/5	Mate12	24686		1.Qh6 Ra1+ 2.Kg2 Ra2+ 3.Kf3 Ra3+
					4.Ke4 Ra4+ 5.Kd5 Ra5+ 6.Kc4 Ra4+
					7.Kb5 Rb4+ 8.Kc6 Rc4+ 9.Kd5 Rc5+
					10.Kxc5 Bd6+ 11.Kxd6 g5 12.Qg7#
0:00	4/6	Mate12	27709		1.Qh6 Ra1+ 2.Kg2 Ra2+ 3.Kf3 Ra3+
					4.Ke4 Ra4+ 5.Kd5 Ra5+ 6.Kc4 Ra4+
					7.Kb5 Rb4+ 8.Kc6 Rc4+ 9.Kd5 Rc5+
					10.Kxc5 Bd6+ 11.Kxd6 g5 12.Qg7#
0:00	5/7	Mate12	46516		1.Qh6 Ra1+ 2.Kg2 Ra2+ 3.Kf3 Ra3+
					4.Ke4 Ra4+ 5.Kd5 Ra5+ 6.Kc4 Ra4+
					7.Kb5 Rb4+ 8.Kc6 Rc4+ 9.Kd5 Rc5+
					10.Kxc5 Bd6+ 11.Kxd6 g5 12.Qg7#
0:01	6/8	Mate12	93838		1.Qh6 Ra1+ 2.Kg2 Ra2+ 3.Kf3 Ra3+
					4.Ke4 Ra4+ 5.Kd5 Ra5+ 6.Kc4 Ra4+
					7.Kb5 Rb4+ 8.Kc6 Rc4+ 9.Kd5 Rc5+
					10.Kxc5 Bd6+ 11.Kxd6 g5 12.Qg7#
0:02	7/9	Mate12	202269		1.Qh6 Ra1+ 2.Kg2 Ra2+ 3.Kf3 Ra3+
					4.Ke4 Ra4+ 5.Kd5 Ra5+ 6.Kc4 Ra4+
					7.Kb5 Rb4+ 8.Kc6 Rc4+ 9.Kd5 Rc5+
					10.Kxc5 Bd6+ 11.Kxd6 g5 12.Qg7#

Using the N-best feature, it says that Qc8+ is a Mate in 13:

Time	Depth	Score	Positions	Moves
0:02	7/9	Mate12	277526		1.Qh6 Ra1+ 2.Kg2 Ra2+ 3.Kf3 Ra3+
					4.Ke4 Ra4+ 5.Kd5 Ra5+ 6.Kc4 Ra4+
					7.Kb5 Rb4+ 8.Kc6 Rc4+ 9.Kd5 Rc5+
					10.Kxc5 Ba7+ 11.Kc4 g5 12.Qg7#
0:04	7/9	Mate13	579575		1.Qc8+ Kh7 2.Qf8 Ra1+ 3.Kg2 Ra2+
					4.Kf3 Ra3+ 5.Ke4 Ra4+ 6.Kd5 Ra5+
					7.Kc4 Ra4+ 8.Kb5 Rb4+ 9.Kc6 Rc4+
					10.Kd5 Rc5+ 11.Kxc5 Ba7+ 12.Kc4
					g5 13.Qg7#

jm

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