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Subject: Re: Testposition - The Winning Arrow

Author: John Merlino

Date: 12:07:53 03/02/01

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On March 02, 2001 at 09:29:37, Sune Larsson wrote:

>
>  [D]8/p1p2pp1/1pP3p1/3Pb2k/4P3/5P1P/8/3K2B1 w - - 0 2
>
>  From Queckenstadt 1914 (published in Sydsvenska Dagbladet /Swedish newspaper/)
>
>  Here we have a bishop ending. White is a pawn down and black has two
>  passers. No wonder your evals show a +score for black. But they should
>  change cause white is winning this position. His pawns c6,d5,e4,f3
>  resembles an arrow, and once white lets it off there is fire on the board!
>
>  Test: White to move and win - could you do that under normal tournament
>        conditions (40/2)
>
>  Sune

CM8000 sees 1.f4 as drawing in 1:29 (on a P3-600), but doesn't see the win in
less than 5 minutes:

Time	Depth	Score	Positions	Moves
0:01	7/9	-1.89	149740		1. Bf2 a5 2. Kc2 a4 3. Be1 b5 4.
					Bb4 g5 5. Ba3 Kg6
0:05	8/10	-1.77	484472		1. Bf2 a5 2. Kc2 a4 3. Be1 b5 4.
					Bb4 Kg5 5. Ba3 Kf4
0:16	9/11	-1.76	1533831		1. Bf2 g5 2. Kc2 a5 3. Be1 f6 4.
					Kb3 g6 5. Ka4 f5 6. Bd2 Bb2
0:24	9/11	-1.48	2213255		1. f4 Bxf4 2. Bd4 f6 3. e5 fxe5
					4. Be3 Bg3 5. d6 e4 6. d7 Bh4 7.
					Bd2
0:32	10/12	-1.71	3003173		1. f4 Bxf4 2. Bd4 Kh4 3. e5 Bg5
					4. e6 fxe6 5. dxe6 Kxh3 6. Bxg7
					Be7 7. Be5
1:29	11/13	0.00	8227436		1. f4 Bxf4 2. Bd4 f6 3. e5 fxe5
					4. Be3 Bg3 5. Bf2 Bf4 6. Be3
2:28	12/14	0.00	13916646	1. f4 Bxf4 2. Bd4 f6 3. e5 fxe5
					4. Be3 Bg3 5. Bf2 Bf4 6. Be3
5:18	13/15	0.00	30026839	1. f4 Bxf4 2. Bd4 f6 3. e5 fxe5
					4. Be3 Bg3 5. Bf2 Bf4 6. Be3

jm





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