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Subject: Re: Testposition endgame /difficult?

Author: Steven J. Brann

Date: 11:23:38 07/27/03

Go up one level in this thread


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.
>
>I only tried Yace so far that had a very hard time with this position
>
>852631702 14:51.1   0.45 20.  1...Bxg7 2.Bxf5 Bh6 3.Bc8 a5 4.Ba6 b4 5.Kg6 Bc1
>                               6.h4 Bxb2 7.h5 Kd4 8.h6 Kc3 9.Bc4 Kd2 10.Kf5
>                               Ke3 11.h7H Bh8H {80}
>
>How do other engines do? Please give them some time to see if they really keep
>Be6+ .
>
>Peter

CM9000 with custom personality and SS=12 locks on to 1...Be6+ in 13 seconds and
stays with it over time with the winning line and increasing score.

Time	Depth	Score	Positions	Moves
0:00	1/3	-1.09	300		1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4
0:00	1/4	-1.09	768		1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4
0:00	1/5	-0.98	2113		1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 Bd1 5.Bg6
0:00	1/6	-0.98	5013		1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 Bd1 5.Bg6
0:00	1/7	-0.69	10060		1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 Bd1 5.Bg6 Bf3 6.h5
0:00	1/7	-1.71	12269		1...Bxg7 2.Kxg7 Bxh7 3.Kxh7 Kf5
					4.Kg7 Kg4 5.Kf6 Kh3 6.b4 cxb4
0:00	1/8	-1.71	16290		1...Bxg7 2.Kxg7 Bxh7 3.Kxh7 Kf5
					4.Kg7 Kg4 5.Kf6 Kh3 6.b4 cxb4
0:00	1/9	-1.59	35701		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.Kf7 c4 5.Kg7 cxb3 6.h4 Kg4
0:00	2/10	-2.00	61339		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.Kf7 c4 5.Ke7 cxb3 6.Kd6 Ke4 7.h4
0:00	3/11	-1.81	86075		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.h3 c4 5.Kh6 cxb3 6.h4 a4 7.h5 a3
0:00	4/12	-1.43	203429		1...Bxg7 2.Kxg7 Bxh7 3.Kxh7 Kf5
					4.Kh6 Kg4 5.Kg6 Kh3 6.Kf6 Kxh2
					7.Ke6 c4 8.bxc4 bxc4 9.Kd5
0:00	5/13	-0.64	439092		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.h4 Kg4 5.Kf6 Kxh4 6.Ke6 Kg4 7.Kd5
					b4 8.Kxc5 Kf5 9.Kd5
0:01	6/14	-0.64	849872		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.h4 Kg4 5.Kf6 Kxh4 6.Ke6 Kg4 7.Kd5
					b4 8.Kxc5 Kf5 9.Kd5
0:03	7/15	-0.52	1890948		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.h4 Kg4 5.Kf6 c4 6.bxc4 bxc4 7.h5
					Kxh5 8.Ke5 Kg4 9.Kd5 Kf5 10.Kxc4
					Ke5
0:09	8/16	-0.48	4544875		1...Bxg7 2.Bxf5 Kxf5 3.Kxg7 a5
					4.h4 Kg4 5.Kf6 c4 6.bxc4 bxc4 7.h5
					Kxh5 8.Ke5 Kg4 9.Kd5 Kf5 10.Kd4
					a4 11.Kxc4
0:13	8/16	-0.54	6680495		1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Kf4
					4.Bc2 Kg5 5.Kf8 Kf6 6.h4 Bg4 7.Kg8
					Bf5 8.Bd1 Kg6 9.h5+ Kh6 10.Kf7
					a5 11.Kf6
0:25	9/17	-1.04	12882880	1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 c4 5.h5 b4 6.Bg8 Kd4 7.h6
					Bc2 8.h7 Bxh7 9.Bxh7 c3 10.bxc3+
					Kxc3 11.Kf6 a5 12.Ke5
0:44	10/18	-0.84	22533842	1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 c4 5.h5 b4 6.Bg6 c3 7.bxc3
					bxc3 8.h6 c2 9.h7 c1=Q 10.h8=Q
					Bc4 11.Qd8 Kf4 12.Qf6+ Kg3 13.Qe5+
					Kg2
1:25	11/19	-0.78	44531266	1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 c4 5.h5 b4 6.Bg6 c3 7.bxc3
					bxc3 8.h6 c2 9.h7 c1=Q 10.h8=Q
					Bc4 11.Qd8 Kf4 12.Qd4+ Kg3 13.Kf6
					Kg2 14.Bf5
3:12	12/20	-1.06	92753088	1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 Bd1 5.Bg6 c4 6.h5 Bxh5 7.Bxh5
					b4 8.Bg6 Kd4 9.Kf6 c3 10.bxc3+
					Kxc3 11.Ke5 a5 12.Bb1 b3 13.Ke4 a4
5:52	13/21	-1.20	169352795	1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 Bd1 5.Bg6 c4 6.h5 Bxh5 7.Bxh5
					b4 8.Be8 b3 9.Kh6 Kd4 10.Kg5 c3
					11.bxc3+ Kxc3 12.Kf4 a5 13.Ke3
					b2 14.Bg6
14:52	14/22	-1.89	391542666	1...Be6+ 2.Kg6 Bxg7 3.Kxg7 Bxb3
					4.h4 Bd1 5.Bg6 Kd4 6.Kf6 Kc4 7.Bf7+
					Kb4 8.Ba2 c4 9.Kg5 c3 10.bxc3+
					Kxc3 11.h5 b4 12.h6 Bc2 13.Bg8
					a5 14.h7 Bxh7 15.Bxh7

Steve



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