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Subject: Re: Test Position: deFirmian-Miles -- Mate in 11

Author: Michael Luth

Date: 20:16:56 11/13/01

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On November 13, 2001 at 19:53:14, John Merlino wrote:

>Here's a position from a game the 1988 US Championship in Cambridge Springs. Of
>special interest, note the move number.
>
>[D]rn3r1k/ppBnN1p1/2p1p3/6Np/q2bP1b1/3B4/PPP3PP/R2Q1R1K w - - 0 17
>
>Chessmaster 8000 says Mate in 11 in 1:05 on a PIII-600. How does everybody else
>do?
>
>Time	Depth	Score	Positions	Moves
>----	----	----	----		----
>0:00	1/3	2.36	4894		17.Rxf8+ Nxf8 18.Nf7+ Kh7 19.e5+
>					g6 20.Qd2 Kg7 21.Rf1 Bf5 22.Nxf5+
>					exf5
>0:00	1/3	2.52	7750		17.Ng6+ Kg8 18.Rxf8+ Nxf8 19.Ne7+
>					Kh8 20.Nf7+ Kh7 21.e5+ g6 22.Qd2
>					Kg7 23.Rf1
>0:00	1/4	2.36	21760		17.Ng6+ Kg8 18.Rxf8+ Nxf8 19.Ne7+
>					Kh8 20.Nf7+ Kh7 21.e5+ g6 22.Qd2
>					Kg7 23.Rf1 Bf5 24.Nxf5+ exf5
>0:03	2/5	4.58	121477		17.Ng6+ Kg8 18.Rxf8+ Nxf8 19.Ne7+
>					Kh8 20.Qf1 Nbd7 21.Qf7 Nf6 22.e5
>					Bf5 23.exf6
>0:09	2/6	6.40	372629		17.Ng6+ Kg8 18.Rxf8+ Nxf8 19.Ne7+
>					Kh8 20.Qf1 Bf2 21.Qxf2 Nbd7 22.e5
>					g6 23.Nxg6+ Nxg6 24.Bxg6
>0:31	3/7	Mate14	1358318		17.Ng6+ Kg8 18.Rxf8+ Nxf8 19.Ne7+
>					Kh8 20.Nf7+ Kh7 21.e5+ g6 22.Qd2
>					Be3 23.Qxe3 Kg7 24.Qh6+ Kxf7 25.Bxg6+
>					Nxg6 26.Nxg6 Qa3 27.Qh7+ Ke8 28.Qg8+
>					Qf8 29.Qxf8+ Kd7 30.Qd8#
>0:39	3/7	Mate12	1738578		17.Rxf8+ Nxf8 18.Nf7+ Kh7 19.e5+
>					g6 20.Qd2 Be3 21.Qxe3 Kg7 22.Qh6+
>					Kxf7 23.Bxg6+ Nxg6 24.Nxg6 Qa3
>					25.Qh7+ Ke8 26.Qg8+ Qf8 27.Qxf8+
>					Kd7 28.Qd8#
>1:05	3/8	Mate11	2975456		17.Rxf8+ Nxf8 18.Qf1 Bf5 19.exf5
>					Nbd7 20.fxe6 g6 21.Qf7 Nf6 22.Nxg6+
>					Nxg6 23.Qxg6 Rf8 24.Qh6+ Kg8 25.Bh7+
>					Kh8 26.Qxf8+ Ng8 27.Qxg8#
>3:56	4/9	Mate11	10555931	17.Rxf8+ Nxf8 18.Qf1 Bf5 19.exf5
>					Nbd7 20.fxe6 g6 21.Qf7 Nf6 22.Nxg6+
>					Nxg6 23.Qxg6 Rf8 24.Nf7+ Rxf7 25.exf7
>					Bxb2 26.f8=Q+ Ng8 27.Qfxg8#
>

........
>jm

John, I didn't see mate in 11.  Mate in 10 in 43s.

CM8K on a 1Gig T-bird with 512M, as-installed settings.

Time	Depth	Score	Positions	Moves
0:00	1/4	2.36	21725		1. Ng6+ Kg8 2. Rxf8+ Nxf8 3. Ne7+
					Kh8 4. Nf7+ Kh7 5. e5+ g6 6. Qd2
					Kg7 7. Rf1 Bf5 8. Nxf5+ exf5
0:00	2/5	4.58	121007		1. Ng6+ Kg8 2. Rxf8+ Nxf8 3. Ne7+
					Kh8 4. Qf1 Nbd7 5. Qf7 Nf6 6. e5
					Bf5 7. exf6
0:02	2/6	6.40	373040		1. Ng6+ Kg8 2. Rxf8+ Nxf8 3. Ne7+
					Kh8 4. Qf1 Bf2 5. Qxf2 Nbd7 6.
					e5 g6 7. Nxg6+ Nxg6 8. Bxg6
0:08	3/7	Mate14	1384049		1. Ng6+ Kg8 2. Rxf8+ Nxf8 3. Ne7+
					Kh8 4. Nf7+ Kh7 5. e5+ g6 6. Qd2
					Be3 7. Qxe3 Kg7 8. Qh6+ Kxf7 9.
					Bxg6+ Nxg6 10. Nxg6 Qa3 11. Qh7+
					Ke8 12. Qg8+ Qf8 13. Qxf8+ Kd7
					14. Qd8#
0:10	3/7	Mate13	1812464		1. Rxf8+ Nxf8 2. Nf7+ Kh7 3. e5+
					g6 4. Qd2 Be3 5. Qxe3 Kg7 6. Qh6+
					Kxf7 7. Bxg6+ Nxg6 8. Qxg6+ Kxe7
					9. Bd6+ Kd8 10. Qf6+ Kc8 11. Qf8+
					Kd7 12. Qe7+ Kc8 13. Qe8#
0:15	3/8	Mate12	2782815		1. Rxf8+ Nxf8 2. Qf1 Bf6 3. Nf7+
					Kh7 4. e5+ Qe4 5. Bxe4+ Bf5 6.
					Bxf5+ exf5 7. Qxf5+ g6 8. Ng5+
					Kh6 9. Ng8+ Kg7 10. Qxf6+ Kxg8
					11. Qf7+ Kh8 12. Qxf8#
0:43	4/9	Mate10	8047997		1. Rxf8+ Nxf8 2. Qf1 Bf6 3. Nf7+
					Kh7 4. e5+ Qe4 5. Bxe4+ Bf5 6.
					Bxf5+ g6 7. Bxg6+ Nxg6 8. Ng5+
					Bxg5 9. Qf7+ Kh8 10. Qg8#

BTW, it tooks Fritz6 4:40 just to find mate in 13 with 128M hash on the same
machine.

Mike



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