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Subject: Re: Testposition - Bronstein

Author: Steven J. Brann

Date: 09:00:41 03/16/01

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On March 16, 2001 at 06:34:23, Sune Larsson wrote:

>
>  [D]2r5/1p1k1p2/p2p2p1/P1PPnp1p/1P1K1N1P/5P2/4R1P1/8 w - - 0 1
>
>  Bronstein-Olafsson, Portoroz 1958
>
>
>  Here white coasts to victory by eliminating black's active knight.
>  In exchange for the rook he gets a)knight+pawn b)4-2 pawns on the
>  queenside  c)a penetrating king  d)a passer. The game went like this:
>
>  1.Rxe5! dxe5 2.Kxe5 Re8+
>
>  (The king's incursion cannot be prevented.)
>
>  3.Kf6 Re3  (a forlorn foray)  4.Kxf7 Rb3 5.Nxg6 Rxb4 6.Ne5+ Kc8
>  7.d6 Rb2 8.Ke8! Rd2 9.Ng6 Kb8 10.g3 Rd1 11.Ne7  1-0
>
>
>  Test: Any horse killing program out there? ;)
>
>  Sune

Not CM8000.  After 21 minutes of thinking, Rxe5 is 11th in the move list.  At
that point CM8K sniffed the move for 1:49, and after that, moved it to 5th for
the next iteration.  But alas, after an hour and 10 minutes it was passed over
once again.  So many moves; so little time!

Steve

Time	Depth	Score	Positions	Moves
0:00	2/6	0.73	33774		1. Re2-e3 f7-f6 2. g2-g3 Kd7-c7
					3. Nf4-e6+ Kc7-b8 4. Re3-c3
0:01	3/7	0.86	146773		1. c5xd6 f7-f6 2. Re2xe5 f6xe5+
					3. Kd4xe5 Rc8-g8 4. g2-g3 Rg8-g7
					5. Nf4-e6 Rg7-f7
0:01	4/8	0.51	206467		1. c5xd6 f7-f6 2. Re2xe5 f6xe5+
					3. Kd4xe5 Rc8-e8+ 4. Ke5-f6 Kd7xd6
					5. Kf6xg6 Kd6-e5 6. Nf4xh5 Re8-g8+
					7. Nh5-g7 Ke5xd5
0:02	4/8	0.71	339870		1. Re2-e3 f7-f6 2. Nf4-e6 Rc8-e8
					3. Re3-c3 Re8-e7 4. f3-f4 Ne5-f7
					5. c5xd6 Kd7xd6
0:07	5/9	0.76	1081951		1. Re2-e3 f7-f6 2. Nf4-e6 Kd7-e8
					3. Re3-e1 Ke8-d7 4. Re1-e2 Rc8-e8
					5. c5xd6 Kd7xd6
0:22	6/10	0.77	3342277		1. Re2-e3 f7-f6 2. Nf4-e6 Kd7-e8
					3. g2-g3 Ke8-d7 4. f3-f4 Ne5-g4
					5. Re3-e2 Rc8-e8 6. c5xd6 Kd7xd6
0:43	6/10	0.83	6309568		1. c5xd6 f7-f6 2. Re2xe5 f6xe5+
					3. Kd4xe5 Rc8-e8+ 4. Nf4-e6 Kd7-c8
					5. Ke5-d4 Re8-g8 6. Ne6-c5 f5-f4
					7. d6-d7+ Kc8-d8 8. Nc5-e6+ Kd8xd7
					9. Ne6xf4
0:54	7/11	0.77	8017124		1. c5xd6 f7-f6 2. Re2xe5 f6xe5+
					3. Kd4xe5 Rc8-g8 4. Nf4-e6 Rg8-e8
					5. g2-g3 Kd7-c8 6. Ke5-f6 Kc8-d7
					7. Kf6xg6 Kd7xd6 8. Kg6xf5 Kd6xd5
1:17	7/11	0.89	11382149	1. Re2-e3 f7-f6 2. Nf4-e2 Kd7-d8
					3. f3-f4 d6xc5+ 4. b4xc5 Ne5-d7
					5. Re3-c3 Rc8-c7 6. c5-c6 b7xc6
					7. d5xc6
2:11	7/11	0.94	19649078	1. Nf4-h3 f7-f6 2. f3-f4 Ne5-g4
					3. Re2-e6 d6xc5+ 4. b4xc5 Rc8-e8
					5. Re6xe8 Kd7xe8 6. Nh3-g1 Ke8-d7
					7. Ng1-f3
3:25	8/12	0.99	31022983	1. Nf4-h3 f7-f6 2. f3-f4 Ne5-g4
					3. Re2-e6 d6xc5+ 4. b4xc5 Rc8-e8
					5. Re6xe8 Kd7xe8 6. Nh3-g1 Ke8-d7
					7. Ng1-e2 Kd7-c7
10:04	9/13	1.05	91948454	1. Nf4-h3 f7-f6 2. f3-f4 Ne5-g4
					3. Nh3-g1 Rc8-d8 4. Kd4-c4 Rd8-f8
					5. Ng1-f3 Rf8-f7 6. Nf3-d4 Kd7-c7
					7. Re2-e8
33:48	10/14	1.11	311577010	1. Nf4-h3 f7-f6 2. f3-f4 Ne5-g4
					3. Nh3-g1 Rc8-g8 4. Ng1-f3 Rg8-g7
					5. Kd4-c4 d6xc5 6. b4xc5 Rg7-e7
					7. c5-c6+ b7xc6 8. d5xc6+ Kd7-d8
					9. Re2xe7 Kd8xe7



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