Author: Ernest Bonnem
Date: 04:27:22 09/17/05
Go up one level in this thread
On September 16, 2005 at 11:43:20, Joachim Rang wrote:
>On September 16, 2005 at 06:29:42, Thomas Lagershausen wrote:
>
>>[D]1r1bnrk1/1qp2ppp/2bp3B/2p2N2/p3P1P1/P4P2/1PPQ3P/2KN2RR w - - 11 20
>>
>>20.Bxg7 !! wins in all variations.
>>
>>Any programs of today are able to solve this?
>>
>>[Event "VK-Hamm"]
>>[Site "?"]
>>[Date "2001.05.13"]
>>[Round "9"]
>>[White "Lagershausen"]
>>[Black "Happel, J"]
>>[Result "1-0"]
>>[ECO "C62/02"]
>>[Opening "Spanisch"]
>>[Variation "Alt Steinitz Verteidigung (d4 ...exd4)"]
>>[TimeControl "40/3600:40/3600:40/3600"]
>>[Termination "normal"]
>>[PlyCount "53"]
>>[WhiteType "program"]
>>[BlackType "program"]
>>
>>1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 exd4 5.Nxd4 Bd7 6.Nc3 Nf6 7.Bg5 Be7 8.Qd2 a6
>>9.Bxc6 bxc6 10.f3 O-O 11.O-O-O c5 12.Nde2 a5 13.g4 a4 14.a3 Rb8 15.Ng3 Qc8
>>16.Nf5 Bd8
>>17.Rdg1 Qb7 18.Nd1 Bc6 19.Bh6 Ne8 20.Bxg7 Nxg7 21.Qh6 Ne6 22.g5 Be8 23.Rg3 Kh8
>>24.Rhg1
>>Rg8 25.Qxh7+ Kxh7 26.Rh3+ Kg6 27.Rh6# {Matt} 1-0
>
>
>finds it but after a long search:
>
>1r1bnrk1/1qp2ppp/2bp3B/2p2N2/p3P1P1/P4P2/1PPQ3P/2KN2RR w - - 0 1
>
>Analysis by Fruit WCCC'05 (AMD 64 @2.4 GHz; Hash 512 MB:
>
>
>1.Bg5 f6 2.Be3 g6 3.Nh6+ Kh8 4.h4 f5 5.gxf5 Bf6 6.c3 Be5 7.fxg6 Rxf3
> = (-0.05) Depth: 12/36 00:00:06 4670kN
>1.Bg5 f6 2.Be3 g6 3.Nh6+ Kh8 4.h4 Ng7 5.h5 g5 6.Qa5 Be7 7.Rg2 Ne6
> = (-0.18) Depth: 13/36 00:00:09 7116kN
>1.Bg5 f6 2.Be3 g6 3.Nh6+ Kh8 4.h4 Ng7 5.h5 g5 6.Qd3 Bb5 7.Qd5 Qxd5 8.exd5 Be7
> = (-0.10) Depth: 14/36 00:00:13 10687kN
>1.Bg5 f6 2.Be3 g6 3.Nh6+ Kh8 4.h4 Ng7 5.h5 g5 6.Qa5 Be7 7.Kb1 Ra8 8.Qc3 Ne6
> = (-0.07) Depth: 15/46 00:00:24 19533kN
>1.Bg5 f6 2.Be3 g6 3.Bh6 Rf7 4.Nfe3 Qa6 5.Nc3 Ng7 6.Bxg7 Kxg7 7.h4 Qb6 8.Nc4 Qa6
>9.Ne3
> = (0.00) Depth: 16/46 00:00:42 35104kN
>1.Bg5 f6 2.Be3 g6 3.Bh6 Rf7 4.Nfe3 Rd7 5.Re1 f5 6.gxf5 Bf6 7.c3 d5 8.exd5 Bxd5
>9.fxg6 hxg6 10.Nxd5 Rxd5
> = (-0.05) Depth: 17/46 00:01:12 59488kN
>1.Bg5 f6 2.Be3 g6 3.Bh6 Rf7 4.Nfe3 Rd7 5.Nd5 Bb5 6.N5e3 c6 7.Bf4 Ba6 8.h4 Qb5
>9.Kb1 Qe2 10.Qxe2 Bxe2
> = (-0.13) Depth: 18/51 00:02:19 112662kN
>1.Bg5 f6 2.Be3 g6 3.Bh6 Rf7 4.h4 Rd7 5.Nfe3 Kh8 6.Re1 f5 7.gxf5 Bf6 8.c3 d5
>9.exd5 Bxd5 10.fxg6 hxg6 11.Nxd5 Rxd5
> = (0.16) Depth: 19/58 00:08:31 418998kN
>1.Bg5 f6 2.Be3 g6 3.Bh6 Rf7 4.h4 Rd7 5.Nfe3 Kh8 6.Kb1 d5 7.exd5 Bxd5 8.Nxd5 Rxd5
>9.Re1 Nd6 10.Qc3 Qb5 11.Bg5 Rd4
> = (0.10) Depth: 20/58 00:12:42 626490kN
>1.Bxg7 Nxg7 2.Qh6 Ne6 3.g5 Kh8 4.g6 fxg6 5.Rxg6 Bxe4 6.Rhg1 Bg5+ 7.R1xg5 Bxf5
>8.Rxe6 c6 9.Rf6 Qe7 10.Rfxf5 Rxf5 11.Rxf5 c4 12.Rg5
> +- (3.18) Depth: 20/76 00:44:49 2275645kN
>1.Bxg7 Nxg7 2.Qh6 Ne6 3.g5 Be8 4.Rg4 Kh8 5.Rhg1 c6 6.Rh4 f6 7.g6 Bxg6 8.Rxg6 Rf7
>9.Nxd6 Qd7 10.Nxf7+ Qxf7 11.Nc3 Nd4 12.f4 Ba5
> +- (3.36) Depth: 21/76 01:08:09 3489689kN
Indeed, Fruit WCCC'05 does find the solution, while Fruit 2.1 on my (slow)
mobile XP2000+ (256 MB hash) has been pondering between 4 hours to 14 hours on
Bxg7 (at depth 21) but still has not chosen it!
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