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Subject: Re: Testposition endgame /difficult?

Author: Slater Wold

Date: 20:32:06 07/27/03

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On July 27, 2003 at 11:05:08, Peter Berger wrote:

>[D]8/5KBB/p4b2/1pp1kb2/8/1P6/1P5P/8 b - - 0 1
>
>That's Em. Lasker - Tarrasch, St. Petersburg 1914
>
>The position is won easily with 1...Be6+ 2. Kg6 Bxg7 3. Kxg7 Bxb3 4. h4 Bd1 -+
>
>But not with 1...Bxg7? 2. Bxf5 =+
>
>The pawn endgame is drawn: 2. ...Kxf5?! 3. Kg7 a5 4. h4 Kg4 5. Kg6! ( and not 5.
>Kf6? c4 6. bc bc 7. Ke5 c3 8. bc a4 9. Kd4 a3 -+, Tarrasch's idea) Kh4 6. Kf5
>Kg3 7. Ke4 Kf2 8. Kd5 Ke3 9. Kc5 Kd3 10. Kb5 Kc2 11. Ka5 Kb3 1/2-1/2
>
>The bishop's ending after 2. Bxf5 is extremely drawish because of the bishops of
>opposite colours.

Rebel 12.0 (beta 1) - P4 3.06Ghz - 200MB HTs:

00:00:00.2	0.30	1	24	Bxh7 Bxf6+ Kd5
00:00:00.2	0.38	1	38	Bxg7 Bxf5 Kxf5 Kxg7
00:00:00.2	1.19	1	124	Be6+ Kg6
00:00:00.2	1.19	2	1061	Be6+ Kg6 Bxg7 Kxg7 Bxb3 h3 Bd1
00:00:00.2	0.88	3	4750	Be6+ Kg6 Bxg7 Kxg7 Bh3 Bd3 Kd4 Be2
00:00:00.2	0.87	4	12240	Be6+ Kg6 Bxg7 Kxg7 Bh3 Bd3 Kd4 Be2
00:00:00.2	0.87	5	26569	Be6+ Kg6 Bxg7 Kxg7 Bh3 Bd3 Kd4 Be2
00:00:00.2	0.85	6	51921	Be6+ Kg6 Bxg7 Kxg7 Bh3 Bg6 Kf4 Kf6
00:00:00.3	0.75	7	130935	Be6+ Kg6 Bxg7 Kxg7 Bh3 Bg6 Ke6 Be4
00:00:00.3	0.91	7	132914	Bxg7 Bxf5 Kxf5 Kxg7 a5 h3 Kg5 Kf7
00:00:00.4	0.91	8	140693	Bxg7 Bxf5 Kxf5 Kxg7 Kg4 Kf6 a5 Ke5
00:00:00.5	0.75	9	315489	Bxg7 Kxg7 Bh3 Bg6 Ke6 Be4 Ke7 Kg6
00:00:00.7	0.75	10	489813	Bxg7 Kxg7 Bh3 Bg6 Ke6 Be4 Bg4 h4
00:00:01.2	0.38	11	1114595	Bxg7 Kxg7 Bh3 Bg6 Ke6 Be4 a5 Bd3
00:00:02.1	0.63	11	2134430	Be6+ Kg6 Bxg7 Kxg7 Kf4 Bc2 Kg5 Kf8
00:00:02.9	0.63	12	3046966	Be6+ Kg6 Bxg7 Kxg7 Kf4 Bc2 Kg5 Kf8
00:00:09.3	0.41	13	10318117	Be6+ Kg6 Bxg7 Kxg7 Kf4 Bc2 Kg5 Kf8
00:00:09.7	0.41	13	10845868	Bxg7
00:00:11.2	1.13	13	12621470	Bxg7 Kxg7 Bxh7 Kxh7 Kf5 h4 a5 h5
00:00:11.3	1.13	14	12739022	Bxg7 Kxg7 Bxh7 Kxh7 Kf5 h4 a5 h5
00:00:16.3	0.87	15	18690914	Bxg7 Bxf5 Kxf5 Kxg7 c4 b4 Kg4 Kf7
00:00:53.7	0.87	15	60066352	Be6+
00:01:50.5	1.99	15	122951420	Be6+ Kg6 Bxg7 Kxg7 Bxb3 h4 Bd1 Bg6
00:02:18.8	1.99	16	154722262	Be6+ Kg6 Bxg7 Kxg7 Bxb3 h4 Bd1 Bg6
00:19:25.4	3.16	17	1276702110	Be6+ Kg6 Bxg7 Kxg7 Bxb3 h4 Bd1 Kh6






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