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Subject: Re: Mate in 8 or 9...How many posibilities...?

Author: John Merlino

Date: 21:14:03 10/26/05

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On October 26, 2005 at 22:51:08, Rob Basham wrote:

>[D]rn1n1rk1/ppqp1p1p/b2p2p1/8/2P1B2N/1P3N1R/PQ3PPP/3R2K1 w - - 0 1
>
>Ruffian 1.0.1 announces mate in 10 in about 92 sec....P3/850
>
>Any engine ann. a mate in about 30 seconds?
>
>Nf5 wins and also
>Bxg6 wins...
>maybe more posibilities......:-)
>
>Rob

CM9_R1 on an AMD 2500 says Mate in 8 after 0:24....

Time	Depth	Score	Positions	Moves
0:00	1/4	4.31	25673		1.Nxg6 fxg6 2.Bxg6 Nbc6 3.Rxh7
					Ne5 4.Nxe5 dxe5 5.Rdxd7
0:00	1/5	4.31	36941		1.Nxg6 fxg6 2.Bxg6 Nbc6 3.Rxh7
					Ne5 4.Nxe5 dxe5 5.Rdxd7
0:00	1/5	5.08	48467		1.Nf5 f6 2.Ne7+ Kg7 3.Ng5 h6 4.Bxg6
					Nbc6 5.Nd5
0:00	1/6	6.49	77127		1.Nf5 f6 2.Ne7+ Kg7 3.Bxg6 hxg6
					4.Ng5 Rf7 5.Rh7+ Kf8 6.Nd5 Qc5
					7.Rh8+ Kg7 8.Nxf7
0:00	1/6	7.20	172554		1.Nxg6 fxg6 2.Bxg6 Nbc6 3.Rxh7
					Ne5 4.Nxe5 Ne6 5.Nxd7
0:00	1/6	10.24	206318		1.Qf6 Qa5 2.Nf5 Qxf5 3.Bxf5 Ne6
					4.Rxd6 Nc6
0:01	1/7	10.30	233182		1.Qf6 Qa5 2.Nf5 Qxf5 3.Bxf5 Ne6
					4.Ng5 Nxg5 5.Qxg5
0:02	1/7	15.80	461425		1.Nf5 f6 2.Ne7+ Kf7 3.Nd5 Kg7 4.Ng5
					h6 5.Nxc7 hxg5 6.Nxa8
0:03	1/8	Mate12	751495		1.Nf5 f6 2.Ne7+ Kf7 3.Rxh7+ Ke8
					4.Bxg6+ Nf7 5.Rxf7 Rxf7 6.Qxf6
					Qa5 7.Qxf7+ Kd8 8.Qe8+ Kc7 9.Qc8+
					Kb6 10.Qd8+ Kc5 11.Rd5+ Kb4 12.Qxa5#
0:06	1/9	Mate10	1835963		1.Nf5 f6 2.Ne7+ Kg7 3.Bxg6 hxg6
					4.Ng5 Rf7 5.Rh7+ Kf8 6.Re1 Ne6
					7.Rxf7+ Ke8 8.Qxf6 Kd8 9.Rf8+ Nxf8
					10.Qxf8#
0:14	1/10	Mate10	3976967		1.Nf5 f6 2.Ne7+ Kg7 3.Bxg6 hxg6
					4.Ng5 Rf7 5.Rh7+ Kf8 6.Re1 Ne6
					7.Rxf7+ Ke8 8.Qxf6 Kd8 9.Rf8+ Nxf8
					10.Qxf8#
0:24	1/10	Mate08	6932051		1.Bxg6 f6 2.Bxh7+ Kf7 3.Bg6+ Kg8
					4.Nf5 Nbc6 5.Qd4 Rf7 6.Qh4 Rh7
					7.Qxh7+ Kf8 8.Qh8#
0:29	1/11	Mate08	8524554		1.Bxg6 f6 2.Bxh7+ Kf7 3.Bg6+ Kg8
					4.Nf5 Nbc6 5.Qd4 Rf7 6.Qh4 Rh7
					7.Qxh7+ Kf8 8.Qg7#

Nf5 does not appear to be any better than a Mate in 10, and Ng5 is at worst a
Mate in 11.

jm



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