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Subject: Re: Difficult mate for programs

Author: John Merlino

Date: 10:29:35 10/12/02

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On October 12, 2002 at 06:04:44, Rex wrote:

>Ruffian results on a 1.533Ghz computer.
>
>00:00:01.2	18.15	8	1415595	Ne5+ Kb6 Bc5+ Qxc5 Nd7+ Ka7 Qxc5+ Ka8
>00:00:02.8	18.47	9	3368004	Ne5+ Kb6 Bc5+ Qxc5 Nd7+ Ka7 Qxc5+ Ka8
>00:00:06.3	18.74	10	7688982	Ne5+ Kb6 Bc5+ Qxc5 Nd7+ Ka7 Qxc5+ Ka8
>00:00:13.0	19.09	11	15529183	Ne5+
>00:00:16.7	 Mate in 11	11	19957155	Ne5+ Kb6 Bc5+ Qxc5 Nd7+ Ka7 Qxc5+ Ka8 Qxc7
>Rhd8 Nb6+ Ka7 Na3 Rd6 Nxb5+ axb5 Nc8+ Ka8 Qa5+ Ra6 Qxa6+ Bxa6 Ra7#
>00:00:36.8	 Mate in 11	12	44015534	Ne5+ Kb6 Bc5+ Qxc5 Nd7+ Ka7 Qxc5+ Ka8 Qxc7
>Rhd8 Nb6+ Ka7 Na3 Rd6 Nxb5+ axb5 Nc8+ Ka8 Qa5+ Ra6 Qxa6+ Bxa6 Ra7#
>00:01:39.7	 Mate in 11	13	117956879	Ne5+ Kb6 Bc5+ Qxc5 Nd7+ Ka7 Qxc5+ Ka8 Qxc7
>Rhd8 Nb6+ Ka7 Na3 Rd6 Nxb5+ axb5 Nc8+ Ka8 Qa5+ Ra6 Qxa6+ Bxa6 Ra7#

Chessmaster 9000, on a PIII-733 (since I'm at home), finds Mate in 12 in
1:04....

Time	Depth	Score	Positions	Moves
0:00	1/3	16.25	1948		1.Ne5+ Qxe5 2.Bxe5 Rhd8 3.Rxc7+
					Kb6 4.Qc5+ Ka5 5.Qa3+ Kb6 6.Rxf7
0:00	1/4	15.95	10179		1.Ne5+ Qxe5 2.Bxe5 Rhd8 3.Qe4+
					Rd5 4.Bxg7
0:00	1/5	17.47	58780		1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Nxb8 Rxb8 6.Qxc7
0:01	1/6	18.09	111671		1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Nxb8 Rxb8 6.Qxc7
					b4 7.Rxf7
0:03	1/7	18.09	277981		1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Nxb8 Rxb8 6.Qxc7
					b4 7.Rxf7
0:08	1/8	19.63	807078		1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Na3 Bxg2 6.Nxb8 Rxb8
					7.Kxg2 Rc8 8.Qc6+ Kb8 9.Qxa6
0:22	1/9	20.39	2451949		1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Na3 Bf3 6.Nxb8 Rxb8
					7.gxf3 Rc8 8.Qc6+ Kb8 9.Qxa6
1:04	1/10	Mate12	7658533		1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Na3 Bf3 6.Qxc7 Rb7
					7.Qa5 Ka7 8.Nxb5+ Rxb5 9.Nc5+ Rb7
					10.Qxa6+ Kb8 11.Rxb7+ Bxb7 12.Qxb7#
4:02	2/11	Mate12	27851982	1.Ne5+ Kb6 2.Bc5+ Qxc5 3.Nd7+ Ka7
					4.Qxc5+ Ka8 5.Na3 Bf3 6.Qxc7 Rb7
					7.Qa5 Ka7 8.Nxb5+ Rxb5 9.Nc5+ Ka8
					10.Qxa6+ Kb8 11.Qa7+ Kc8 12.Qc7#

<BEGIN CONSPIRACY THEORY>
I see that Ruffian has the same "problem" as the Tigers, in that Mate in N
reports are one move less than the actual number of moves. And the output format
is very similar to the Tigers. Hmmmm.....
<END CONSPIRACY THEORY>

:-)

jm



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