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Subject: Re: Nice test position -- After 1...Rc3, if 2.bxc3 = Mate in 10!

Author: John Merlino

Date: 19:40:07 08/06/02

Go up one level in this thread


On August 06, 2002 at 22:33:10, John Merlino wrote:

>On August 06, 2002 at 21:27:30, José Carlos wrote:
>
>>On August 06, 2002 at 21:26:56, José Carlos wrote:
>>
>>[D]1kr2b1r/p4p2/b3p2p/qp1pP2R/1n1p1QP1/N2P1N2/PPP1BP2/K1R5 b - - 0 1 bm Rc3
>
>Chessmaster 9000, on a PIII-600, needs six seconds:
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	0.06	1964		1...Nc6 2.Nb1 Nb4
>0:00	1/4	0.11	5994		1...Nc6 2.Nxd4 Nxd4 3.Qxd4 Bxa3
>					4.bxa3 Qxa3 5.Qb2
>0:00	1/5	0.00	23795		1...Nc6 2.Qxf7 Bxa3 3.Qxe6 Bxb2+
>					4.Kxb2 Qc3+ 5.Kb1 Qb4+ 6.Ka1 Qc3+
>					7.Kb1
>0:01	1/6	0.00	75177		1...Nc6 2.Nb1 Nb4 3.Na3
>0:02	1/7	0.00	145126		1...Nc6 2.Nb1 Nb4 3.Na3
>0:06	1/7	-1.74	404026		1...Rc3 2.Nxd4 Rxa3 3.bxa3 Qxa3
>					4.Nc6+ Nxc6 5.c3 Bg7 6.Rc2 Rc8
>0:09	1/8	-2.84	605085		1...Rc3 2.Qd2 Rxa3 3.bxa3 Qxa3
>					4.c4 Nxa2 5.Qxa2 Qxc1+ 6.Qb1 Qc3+
>					7.Qb2 Ba3 8.Qxc3 dxc3 9.cxd5 exd5
>0:14	1/9	-3.04	958862		1...Rc3 2.Qd2 Rxa3 3.bxa3 Qxa3
>					4.c4 Nxa2 5.Qxa2 Qxc1+ 6.Qb1 Qc3+
>					7.Qb2 Ba3 8.Qxc3 dxc3 9.cxb5 c2
>					10.Rh1 Bxb5
>0:25	1/10	-3.04	1794161		1...Rc3 2.Qd2 Rxa3 3.bxa3 Qxa3
>					4.c4 Nxa2 5.Qxa2 Qxc1+ 6.Qb1 Qc3+
>					7.Qb2 Ba3 8.Qxc3 dxc3 9.cxb5 c2
>					10.Rh1 Bxb5
>0:48	2/11	-3.40	3535945		1...Rc3 2.Qd2 Rxa3 3.bxa3 Qxa3
>					4.c4 Nxa2 5.Qxa2 Qxc1+ 6.Qb1 Qc3+
>					7.Qb2 Ba3 8.Qxc3 dxc3 9.Kb1 bxc4
>					10.dxc4 Bxc4 11.Bxc4 dxc4 12.Kc2
>1:58	3/12	-3.24	9193602		1...Rc3 2.Qd2 Rxa3 3.bxa3 Qxa3
>					4.c4 Nxa2 5.Qxa2 Qxc1+ 6.Qb1 Qc3+
>					7.Qb2 Ba3 8.Qxc3 dxc3 9.Kb1 dxc4
>					10.dxc4 bxc4 11.Ng5 Rd8 12.Rxh6 Rd2
>
>jm

I decided to see what would happen if I forced White to take the rook after
1...Rc3.

[D]1k3b1r/p4p2/b3p2p/qp1pP2R/1n1p1QP1/N1PP1N2/P1P1BP2/K1R5 b - - 0 2

Well, Chessmaster 9000, on a PIII-600, announces Mate in 10 in 49 seconds with
another sacrifice -- Nxa2!:

Time	Depth	Score	Positions	Moves
0:00	1/3	1.39	1129		2...dxc3 3.Qxf7 Qxa3
0:00	1/3	0.00	2453		2...Qxa3 3.cxb4 Qc3+ 4.Kb1 Qxb4+
					5.Ka1 Qc3+ 6.Kb1 Qb4+
0:00	1/4	0.00	3051		2...Qxa3 3.cxb4 Qc3+ 4.Kb1 Qxb4+
					5.Ka1 Qc3+ 6.Kb1 Qb4+
0:00	1/5	0.00	11613		2...Qxa3 3.cxb4 Qc3+ 4.Kb1 Qxb4+
					5.Ka1 Qc3+ 6.Kb1 Qb4+
0:01	1/5	-5.84	64055		2...Nxa2 3.Nd2 Nxc1 4.Kb1 Nxe2
0:01	1/6	-6.01	85925		2...Nxa2 3.Nd2 Nxc1 4.Nb1 Nxe2
					5.Qf6
0:02	1/6	-14.01	99190		2...Qxa3 3.cxb4 Bxb4 4.c4 Bc3+
					5.Rxc3 dxc3 6.Qd2 cxd2 7.Nxd2 Qc3+
					8.Kb1 Qxd2 9.Bf1 Qd1+ 10.Kb2 Qxf1
0:02	1/7	-14.04	122722		2...Qxa3 3.cxb4 Bxb4 4.c4 Bc3+
					5.Rxc3 dxc3 6.Qd2 cxd2 7.Nxd2 Qc3+
					8.Kb1 Qxd2 9.cxd5 Qe1+ 10.Bd1 Qxd1+
					11.Kb2 Qxg4
0:03	1/8	-14.73	224127		2...Qxa3 3.cxb4 Bxb4 4.c4 Bc3+
					5.Rxc3 dxc3 6.Qd2 cxd2 7.Nxd2 Qc3+
					8.Kb1 Qxd2 9.cxd5 Qe1+ 10.Kb2 Qxe2+
					11.Ka1 Qe1+ 12.Kb2 Qxf2+ 13.Kb3
					exd5
0:04	1/9	-15.08	399304		2...Qxa3 3.cxb4 Bxb4 4.c4 Bc3+
					5.Rxc3 dxc3 6.Qd2 cxd2 7.Nxd2 Qc3+
					8.Kb1 Qxd2 9.Bf1 Qd1+ 10.Kb2 Qxf1
					11.f4 Qxf4 12.cxd5 exd5
0:09	1/10	-15.15	937913		2...Qxa3 3.cxb4 Bxb4 4.c4 Bc3+
					5.Rxc3 dxc3 6.Qd2 cxd2 7.Nxd2 Qc3+
					8.Kb1 Qxd2 9.Bf1 Qd1+ 10.Kb2 Qxf1
					11.cxb5 Qxf2+ 12.Kb3 Bxb5
0:49	1/10	-Mate10	5382052		2...Nxa2 3.Qxd4 Nxc3 4.Qxc3 Qxc3+
					5.Ka2 Qxa3+ 6.Kb1 Qb4+ 7.Ka2 Qa4+
					8.Kb1 Ba3 9.Nd2 Qb4+ 10.Nb3 Qc3
					11.Rhh1 Qb2#
0:56	2/11	-Mate10	6123814		2...Nxa2 3.Qxd4 Nxc3 4.Qxc3 Qxc3+
					5.Ka2 Qxa3+ 6.Kb1 Qb4+ 7.Ka2 Qa4+
					8.Kb1 Ba3 9.Nd2 Qb4+ 10.Nb3 Qc3
					11.Rhh1 Qb2#
1:12	3/12	-Mate10	8134485		2...Nxa2 3.Qxd4 Nxc3 4.Qxc3 Qxc3+
					5.Ka2 Qxa3+ 6.Kb1 Qb4+ 7.Ka2 Qa4+
					8.Kb1 Ba3 9.Nd2 Qb4+ 10.Nb3 Qc3
					11.Rhh1 Qb2#

jm



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