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Subject: Re: Testposition - Endgame

Author: Steven J. Brann

Date: 05:56:35 06/24/01

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On June 24, 2001 at 03:40:46, Sune Larsson wrote:

>
>  [D]8/6kP/8/3b1PK1/8/6N1/8/8 w - - 0 1
>
>  In this position white wins with 1.Nh5+. If black takes
>  the h7-pawn then the black bishop goes to heaven.
>
>  When trying this position with Gambit Tiger, I got some
>  strange output. In analyse mode it likes 1.h8B with a draw.
>  Very puzzling indeed.
>
>
>Analyse by Gambit Tiger 2.0
>
>00:00:00.3	2,98	12	96204	Nh5+ Kh8 Nf6 Bb3 Kf4 Kg7 Kg4 Bc4 Kg5 Bf7 Kh4 Bc4
>00:00:00.0	3,08	12	110478	Nh5+ Kh8 Nf6 Bb3 Kf4 Kg7 Ke5 Bc2 Ke6 Bd1 Kd6 Bb3 Kc7
>00:00:01.2	2,18	13	359519	Nh5+
>00:00:02.1	1,56	14	620558	Nh5+ Kh8 Nf6 Bb3 Ng8 Kxh7 Ne7 Kg7 f6+ Kf8 Nf5 Be6 Nd4
>Bg8 Kf5 Ke8
>00:00:04.6	1,69	14	1174926	h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nc3 Kg6 Ne2
>Kf5 Nd4+ Ke5 Nc2
>00:00:04.8	1,69	15	1388715	h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nc3 Kg6 Ne2
>Kf5 Nd4+ Kg6 Nc6 Kf5
>00:00:06.5	1,69	16	1885192	h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nc3 Kg6 Ne2
>Kf5 Nd4+ Kg6 Nc6 Kf5 Nd8
>00:00:09.4	1,71	17	2770718	h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nc3 Kg6 Nd1
>Kf5 Ne3+ Kf4 Kf8 Be6 Nc2
>00:00:13.9	1,71	18	4108035	h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nc3 Kg6 Nd1
>Kf5 Ne3+ Kg5 Nc2 Kf5 Nd4+
>00:00:20.5	1,73	19	6698978	h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nd6+ Kg6
>Nb5 Kf5 Nd4+ Kg6 Ne6 Kf5 Nc5
>00:00:34.9	1,73	20	11655854 h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nd6+ Kg6
>Nb5 Kf5 Nd4+ Kg6 Nc6 Kf5 Nb8
>00:01:44.2	1,73	21	36549655 h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nd6+ Kg6
>Nb5 Kf5 Nd4+ Kg6 Nc6 Kf5 Nd8
>00:03:03.0	1,73	22	63301063 h8B+ Kxh8 Kf6 Bg8 Ke7 Kg7 f6+ Kg6 Ne4 Kf5 Nd6+ Kg6
>Nb5 Kf5 Nd4+ Kg6 Nc6 Kf5 Nd8
>
>Sune

Chessmaster 8K with custom personality w/16MB hash on PII 933 finds Nh5+
initially.  Then ultimately finds Mate14 after 14:30.

Time	Depth	Score	Positions	Moves
0:00	5/10	3.35	59105		1. Nh5+ Kh8 2. Kg6 Bc4 3. Nf6 Bf7+
					4. Kh6 Be6 5. Kg5 Bc4 6. Kg4 Bb5
0:00	6/11	3.87	101564		1. Nh5+ Kh8 2. Kh6 Be4 3. f6 Bg6
					4. Nf4 Bf7 5. Nh3 Bc4 6. Ng5 Bd5
					7. Kg6
0:00	7/12	6.69	173422		1. Nh5+ Kh8 2. Kh6 Be4 3. f6 Bg6
					4. Nf4 Bh5 5. Kxh5 Kxh7 6. Ne6
					Kg8 7. Kg6 Kh8 8. Kf7 Kh7
0:02	8/13	10.63	646604		1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Kg8 5. Kg6 Kf8 6. Nf4
					Kg8 7. f7+ Kf8 8. Ne6+ Ke7 9. f8=Q+
					Kxe6 10. Qe8+ Kd6 11. Kf5 Kc7 12.
					Qe5+ Kc8
0:04	9/14	13.49	1076995		1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke8 5. Kg6 Kf8 6. Nc7
					Kg8 7. f7+ Kf8 8. Ne6+ Ke7 9. Ng5
					Kd7 10. f8=Q Kc6 11. Qe8+ Kb6 12.
					Qe5
0:17	10/15	13.66	3603754		1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke6 5. Nf4+ Kd6 6. Kf5
					Kd7 7. Ng6 Kc6 8. f7 Kb5 9. f8=Q
					Ka4 10. Qc5 Kb3 11. Qd5+ Kb2 12.
					Qd4+ Ka2
0:37	11/16	13.74	7560492		1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke6 5. Nf4+ Kd6 6. Kf5
					Kd7 7. Ng6 Kc6 8. f7 Kb5 9. f8=Q
					Ka4 10. Qc5 Kb3 11. Ne5 Ka2 12.
					Qc3
1:28	12/17	13.74	18001781	1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke6 5. Nf4+ Kd6 6. Kf5
					Kd7 7. Ng6 Kc6 8. f7 Kb5 9. f8=Q
					Kc4 10. Ne5+ Kb3 11. Qc5 Ka2 12.
					Qc3
11:09	13/18	Mate17	131916298	1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke6 5. Nf4+ Kf7 6. Kf5
					Kg8 7. Ke6 Kh8 8. f7 Kg7 9. Ke7
					Kh6 10. f8=Q+ Kg5 11. Ne6+ Kg4
					12. Qf4+ Kh3 13. Ng5+ Kg2 14. Ne4
					Kh1 15. Qf3+ Kg1 16. Qf2+
14:30	14/19	Mate14	177995850	1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke6 5. Nf4+ Kf7 6. Kf5
					Kg8 7. Ke6 Kh8 8. f7 Kg7 9. Ke7
					Kh6 10. Kf6 Kh7 11. Ne6 Kh6 12.
					f8=Q+ Kh5 13. Qb4 Kh6 14. Qh4#
15:56	15/20	Mate14	206049326	1. Nh5+ Kxh7 2. Nf6+ Kg7 3. Nxd5
					Kf7 4. f6 Ke6 5. Nf4+ Kd6 6. f7
					Ke7 7. Kg6 Kf8 8. Ne6+ Ke7 9. f8=Q+
					Kd7 10. Kf5 Kc6 11. Qb8 Kd7 12.
					Qc7+ Ke8 13. Qd8+ Kf7 14. Qf8#

Steve



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