Author: Joachim Rang
Date: 12:26:30 10/26/05
Go up one level in this thread
On October 26, 2005 at 14:46:22, Dieter Buerssner wrote:
>The nightmare positions can be found here:
>http://www.beepworld.de/members38/eigenmann/nightmare.htm
>
>[D] 6R1/4p3/B2p4/P7/4P3/p3n3/1n6/4K2k w - -
>
>This is a very deep position. Yace cannot find Rc8 in 10 hours. The analysis
>given by Walter:
>
>[Event "Pervakov 1984"]
>[Site "?"]
>[Date "????.??.??"]
>[Round "?"]
>[White "Nightmare Nr.025"]
>[Black "?"]
>[Result "*"]
>[Annotator "W.Eigenmann"]
>[SetUp "1"]
>[FEN "6R1/4p3/B2p4/P7/4P3/p3n3/1n6/4K2k w - - 0 1"]
>[PlyCount "15"]
>[Source "Walter Eigenman"]
>[SourceDate "2005.09.30"]
>
>1. Rc8 $18 a2 (1... Kg2 2. Rc1 a2 3. Kd2 $18) 2. Rc1 a1=Q 3. Rxa1 Nc2+ 4. Kf2+
>Nxa1 5. Bb5 Nd1+ 6. Kg3 Nc3 7. Bc6 Ne2+ 8. Kh4 $18 *
>
>
>Is the position at the end of the main line a forced win for white?
>
>[D] 8/4p3/2Bp4/P7/4P2K/8/4n3/n6k b - - 7 8
>
>Yace seems not to be able to win from here with white.
>
>Regards,
>Dieter
I'm not sure if it is a win either. White can promote tha a-pawn and play with
the queen against two knights but I don't see how white can make progress.
[Event "Pervakov 1984"]
[Site "?"]
[Date "2005.10.26"]
[Round "?"]
[White "Nightmare Nr.025"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "6R1/4p3/B2p4/P7/4P3/p3n3/1n6/4K2k w - -"]
1. Rc8 $18 a2 (1... Kg2 2. Rc1 a2 3. Kd2 $18) 2. Rc1 a1=Q
3. Rxa1 Nc2+ 4. Kf2+ Nxa1 5. Bb5 Nd1+ 6. Kg3 Nc3 7. Bc6
Ne2+ 8. Kh4 $18 Nd4 9. Bd7 Nf3+ 10. Kh5 Nb3 11. a6 Nc5
12. a7 Nxd7 13. a8=Q Kg2 *
Q7/3np3/3p4/7K/4P3/5n2/6k1/8 w - -
Engine: Fruit 2.2.1 (128 MB)
by Fabien Letouzey
1/05 0:00 +2.29 14.Qg8+ Kf2 (132)
2/08 0:00 +2.19 14.Qg8+ Kf2 15.Qa2+ Ke3 16.Qa7+ Nc5
17.Qxe7 Nxe4 (266)
2/09 0:00 +2.29 14.Qa2+ Kg3 15.Qg8+ Kf2 (373)
2/09 0:00 +2.46 14.Qb7 Nfe5 (411)
3/09 0:00 +2.42 14.Qb7 Nfe5 15.Kg5 (549)
4/10 0:00 +2.40 14.Qb7 Nfe5 15.Kg5 Nc5 (1.306)
4/14 0:00 +2.44 14.Kg4 Nfe5+ 15.Kf4 Nc5 16.Qg8+ Kf2
17.Qa2+ Ke1 (2.236)
5/14 0:00 +2.49 14.Kg4 Nfe5+ 15.Kf4 Nc5 16.Qg8+ Kf2
17.Qg3+ Ke2 18.Qe3+ Kd1 (3.193)
6/16 0:00 +2.49 14.Kg4 Nfe5+ 15.Kf4 Nc5 16.Qg8+ Kf2
17.Qg3+ Ke2 18.Qe3+ Kd1 (6.234)
6/18 0:00 +2.60 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Kf5 (10.155)
7/18 0:00 +2.67 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Kf5 d5 (11.973)
8/18 0:00 +2.59 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qe6 Kf3 18.Qf5+ Ke3 (13.557)
9/22 0:00 +2.47 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 d5
17.Kf5 Kf2 18.Qa7+ Kg3 19.Qc7+ Kf2 (46.012)
9/22 0:00 +2.50 14.Kg4 Nfe5+ 15.Kf4 Nc5 16.Qg8+ Kf2
17.Qa2+ Ke1 18.Qc2 e6 19.Qc1+ Ke2
20.Qe3+ Kd1 (74.069)
10/25 0:00 +2.54 14.Kg4 Nfe5+ 15.Kf4 Kf2 16.Qa2+ Ke1
17.Qg2 Nc5 18.Ke3 Nc4+ 19.Kd4 Ne5
20.Qg3+ Ke2 21.Qe3+ Kd1 (266.730) TB:1
10/25 0:00 +2.61 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Nc3 18.Kg5 Nde4+ 19.Kg4 Nf2+
20.Kf5 (271.477) TB:1
11/26 0:00 +2.64 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Nc3 18.Kg5 d5 19.Qg7 Nde4+
20.Kf4+ Kf2 21.Qd4+ Ke2 (450.950) TB:1
12/28 0:00 +2.66 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Kg3 18.Kf5 Kf3 19.Qb7 Ke3
20.Qb6+ Kd3 (946.238) TB:1
13/28 0:00 +2.64 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Nb1 18.Kf5 Nbc3 19.Kf4 Kf2
20.Qg7 d5 21.Qd4+ Ke2 (960.423) TB:2
14/32 0:02 +2.66 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Kg3 18.Qf5 Kg2 19.Kf7 Kg3
20.Ke7 Kh4 21.Qf4+ Kh5 (3.956.077) 1416 TB:6
15/32 0:02 +2.68 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Nc3 18.Qf4 Nde4 19.Kf5 d5
20.Ke5 Ng3 21.Qd2+ Nge2 22.Qg5+ Kf3
23.Qf5+ Ke3 (4.033.615) 1414 TB:9
16/32 0:02 +2.65 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 Nfd2
17.Qf7 Nc3 18.Qf4 Nde4 19.Kf5 d5
20.Ke5 Ng3 21.Qd2+ Nge2 22.Qd3 d4 (4.033.975) 1388 TB:13
17/37 0:05 +2.41 14.Qd8 Nf6+ 15.Kg6 Nxe4 16.Qxe7 d5
17.Kf5 Neg5 18.Qb7 d4 19.Qb2+ Kg3
20.Qb3 Kf2 21.Qd3 Kg3 22.Qc4 Kf2
23.Kf4 (6.765.023) 1348 TB:267
17/39 0:11 +2.44 14.Kg4 Nfe5+ 15.Kf4 Kf2 16.Qa2+ Ke1
17.Ke3 Ng4+ 18.Kd4 Nc5 19.Qa7 Ne5
20.Kd5 Ned7 21.Qa1+ Ke2 22.Qb2+ Kd3
23.Qb1+ Kd2 24.Qb4+ Kc2 25.Qc4+ Kd2
26.Kd4 (15.214.722) 1379 TB:391
18/40 0:35 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Qf1 Kg3 22.Qf2+ Kh3
23.Qf5+ Kh4 24.Ke3 Ng4+ 25.Kd2 N4e5
26.Ke2 (49.198.639) 1385 TB:936
19/40 0:46 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Qf1 Ng4 22.Qf7 N4e5
23.Qf5 e6 24.Qf6+ Kg3 25.Qg5+ Kh3
26.Qd2 (62.369.830) 1335 TB:1.803
20/42 1:05 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Qf1 Kg4 22.Ke3 Kg5
23.Qf5+ Kh6 24.Kd4 Kg7 25.Kc3 Nc6
26.Qd7 (86.141.531) 1327 TB:3.329
21/42 1:38 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Qf1 Kg5 22.Qf5+ Kh6
23.Ke3 Kg7 24.Qe6 Nc6 25.Kd2 Nd4
26.Qd7 Nf3+ 27.Ke3 (126.849.695) 1289
TB:7.097
22/44 2:25 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Qf1 Kg5 22.Qf5+ Kh6
23.Ke3 Kg7 24.Qe6 Nc6 25.Qg4 Kf6
26.Qf3+ Kg7 27.Qg2 (185.745.407) 1275
TB:12.188
23/48 3:49 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Kd2 Kg5 22.Ke3 Kh4
23.Ke2 Kg4 24.Qc8+ Kg3 25.Ke3 Ng4+
26.Kd2 N6e5 27.Qe6 (294.970.707) 1284
TB:19.491
24/52 6:34 +2.44 14.Kg4 Nde5+ 15.Kf4 Ng6+ 16.Ke3 Nfe5
17.Qa2+ Kh3 18.Qb1 Kh4 19.Qc1 Ng4+
20.Ke2 N4e5 21.Kd2 Kg5 22.Ke3 Kh4
23.Ke2 Kg4 24.Qc8+ Kg5 25.Qf5+ Kh6
26.Kd2 Kg7 27.Kc3 (507.573.901) 1287
TB:32.108
best move: Kh5-g4 time: 11:58.875 min n/s: 1.314.832 CPU 100.0% n/s(1CPU):
1.314.832 nodes: 945.200.000 TB: 50.344
Joachim
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