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Subject: Re: Tricky Pawn Ending [chesscafe.com]

Author: John Merlino

Date: 11:14:39 02/27/02

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On February 27, 2002 at 08:05:06, José Antônio Fabiano Mendes wrote:

>       Source ==> http://209.176.8.36/hans/hans.htm
>       I wonder what the chess programs could uncover here. JAFM
>       [D]1k6/pp3p2/5P2/1p6/1p6/1P6/7P/1K6 w

With White to move, Chessmaster 8000 says this (note the promotion to a knight
as promoting to a queen is a draw, but the knight promotion allows Ng6! forcing
the black pawn to capture and allow the f6 pawn to promote. So the Black King
must come back to defend....):

Time	Depth	Score	Positions	Moves
0:00	6/7	5.65	2577		1.h4 a5 2.h5 a4 3.h6 a3 4.h7 a2+
					5.Kxa2
0:00	7/8	6.67	5190		1.h4 Kc7 2.h5 Kd6 3.h6 Ke5 4.h7
					Kxf6 5.h8=Q+ Kg6 6.Qe5
0:00	8/9	6.67	7643		1.h4 Kc7 2.h5 Kd6 3.h6 Ke5 4.h7
					Kxf6 5.h8=Q+ Kg6 6.Qe5
0:00	9/10	7.27	13301		1.h4 Kc7 2.h5 a6 3.h6 a5 4.h7 a4
					5.h8=Q axb3 6.Kb2
0:00	10/11	2.18	31681		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc5 7.Ne5
0:00	11/12	2.12	39605		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc5 7.Ne5
					Kd6
0:00	12/13	2.21	49279		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.f7
0:00	13/14	2.17	65900		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.f7 Ke7 9.Kc2
0:00	14/15	2.26	95039		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Kc2 a5 9.f7
0:01	15/16	2.21	146787		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Kc2 a5 9.f7 Ke7 10.Kd3
0:02	16/17	2.21	239044		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Kc2 a5 9.f7 Ke7 10.Kd3
0:03	17/18	2.22	393055		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Kc2 a5 9.f7 Ke7 10.Kd3 a4
0:05	18/19	2.00	661031		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Kc2
					a5 8.Ng5 Kd6 9.Nh7 Ke6 10.Kd3 a4
0:09	19/20	1.51	1050117		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Kc2
					a5 8.Ng5 Kd6 9.Kb2 a4 10.Ka2 a3
					11.f7 Ke7
0:14	20/21	1.50	1629110		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Kc2
					a5 8.Ne5 Kd6 9.Kd3 a4 10.f7 Ke7
					11.Kd2 axb3 12.Kc1
0:21	21/22	1.44	2501613		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Kc2
					a5 8.Ne5 Kd6 9.Kd3 a4 10.Kc2 a3
					11.Kb1 Ke6 12.f7 Ke7 13.Ka2
0:33	22/23	1.44	3938879		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Kc2
					a5 8.Ne5 Kd6 9.Kd3 a4 10.Kc2 a3
					11.Kb1 Ke6 12.f7 Ke7 13.Ka2
0:52	23/24	1.43	6130384		1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Kc2
					a5 8.Ne5 Kd6 9.Kd3 a4 10.Kc2 Ke6
					11.f7 Ke7 12.Kb2 a3+ 13.Kb1 Kf8
					14.Ka2
1:27	24/25	1.56	10131135	1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Nd3 Ke6 9.Nxb4 Kxf6 10.Nd3
					a5 11.Nc5 a4 12.b4 b6 13.Nd7+ Ke6
					14.Nxb6
2:25	25/26	1.60	16658264	1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Nd3 Ke6 9.Nxb4 Kxf6 10.Nd3
					b6 11.Nb4 a5 12.Nd5+ Ke5 13.Nxb6
					a4 14.b4 a3 15.Ka2
5:10	26/27	1.64	33903636	1.h4 Kc7 2.h5 a6 3.h6 Kb6 4.h7
					Ka5 5.h8=N Kb6 6.Nxf7 Kc7 7.Ne5
					Kd6 8.Nd3 Ke6 9.Nxb4 Kxf6 10.Nd3
					b6 11.Nb4 a5 12.Nd5+ Ke5 13.Nxb6
					a4 14.b4 a3 15.Nd7+ Ke6

>       [D]1k6/pp3p2/5P2/1p6/1p6/1P6/7P/1K6 b

With Black to move, Black wins easily:

Time	Depth	Score	Positions	Moves
0:00	2/3	-3.36	71		1...Kc7 2.h4 Kd6 3.h5
0:00	3/4	-3.58	145		1...Kc7 2.h4 Kd6 3.h5 Ke5
0:00	4/5	-3.58	337		1...Kc7 2.h4 Kd6 3.h5 Ke5
0:00	5/6	-5.10	950		1...Kc7 2.h4 Kd6 3.h5 Ke5 4.h6 Kxf6
0:00	6/7	-4.99	1888		1...Kc7 2.h4 Kd6 3.h5 Ke5 4.h6
					Kxf6 5.Kc2
0:00	7/8	-5.03	3071		1...Kc7 2.h4 Kd6 3.h5 Ke5 4.h6
					Kxf6 5.Kc2 Kg6
0:00	8/9	-5.03	4798		1...Kc7 2.h4 Kd6 3.h5 Ke5 4.h6
					Kxf6 5.Kc2 Kg6
0:00	9/10	-5.38	9242		1...Kc7 2.h4 Kd6 3.Kc2 Ke5 4.Kd3
					Kxf6 5.Kd4 Kg6 6.Ke4 f5+ 7.Kf4
0:00	10/11	-5.34	14516		1...Kc7 2.h4 Kd6 3.Kc2 Ke5 4.Kd3
					Kxf6 5.Ke4 Kg6 6.Kf4 f5
0:00	11/12	-6.17	30156		1...Kc7 2.h4 Kd6 3.Kc2 Ke5 4.Kd2
					a5 5.Kd3 a4 6.h5 axb3 7.h6 Kxf6
0:00	12/13	-6.28	51916		1...Kc7 2.h4 Kd6 3.Kc2 Ke5 4.Kd2
					a5 5.Kc2 Kxf6 6.Kd3 a4 7.bxa4 bxa4
					8.h5 Ke5
0:01	13/14	-6.90	136283		1...Kc7 2.Kc2 Kd6 3.Kd3 Ke5 4.Kc2
					Kxf6 5.Kd2 a5 6.Kd3 Ke5 7.h3 a4
					8.bxa4 bxa4
0:02	14/15	-7.08	250026		1...Kc7 2.Kc2 Kd6 3.Kd3 a5 4.h4
					Ke5 5.Kd2 Kxf6 6.Ke3 Kg6 7.Kf4
					a4 8.Ke3 axb3
0:04	15/16	-8.31	531023		1...Kc7 2.Kc2 Kd6 3.Kd3 a5 4.h4
					Ke5 5.h5 Kxf6 6.h6 Kg6 7.Ke3 Kxh6
					8.Ke4 a4 9.bxa4 bxa4
0:08	16/17	-8.48	980563		1...Kc7 2.Kc2 Kd6 3.Kd3 a5 4.h4
					Ke5 5.h5 Kxf6 6.h6 Kg6 7.Ke3 Kxh6
					8.Ke4 a4 9.bxa4 bxa4 10.Kd4 b3
0:20	17/18	-8.59	2265541		1...Kc7 2.Kc2 Kd6 3.Kd3 a5 4.h4
					Ke5 5.h5 Kxf6 6.h6 Kg6 7.Ke3 Kxh6
					8.Ke4 Kg5 9.Kd3 a4 10.bxa4 bxa4
0:54	18/19	-9.24	5817994		1...Kc7 2.Kc2 Kd6 3.Kd3 a5 4.h4
					Ke5 5.h5 Kxf6 6.h6 Kg6 7.Kd4 a4
					8.bxa4 bxa4 9.Kc4 Kxh6 10.Kxb4
					Kg5 11.Kxa4 f5

jm




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