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Subject: Re: BS 2830 Problem #5 is wrong.

Author: Joachim Rang

Date: 05:19:21 03/17/04

Go up one level in this thread


On March 16, 2004 at 18:58:46, Dann Corbit wrote:

>See this thread:
>http://www.talkchess.com/forums/1/message.html?354948

well after some study with Shredder 8 it is my opinion, that the testposition is
wrong in that aspect, that it is not clear whether Rxe6 is the only move to win
the game. But I am quite sure, that it is a winning move, but Qh3 dould be
winning also (most likely I think).

The main variation after Rxe6 is the following one:

1.Rxe6 Qxe6 2. Rde1 Qf5 (Qd6 3.Bf4 h5 4. Qxc8 Rxc8 5. Bxd6 Bxd6 6. Bxd5+ +-) 3.
Qxf5 gxf5 (all other moves loose instantly) 4. Bxd5+ Kg6 (only move):

Now Shredder 8 gives + 2.36 at depth 25. This is not a prove but it seems
unlikely that this position is not won for white.

As i posted before I get +1.98 wiht a 24ply-search for 1. Qh3 in the
startposition, which also seems rather convincing, that this move will lead to a
win too. But I was too lazy to create variations here).

regards Joachim

P.S.:
New game
2r1r3/p3b2p/1pn2pkB/3B1p2/3P4/P4N2/1P3PPP/4R1K1 w - - 0 1

Analysis by Shredder 8:

5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.Bd5-e6 Rc8-d8 8.d4-d5 Be7-d6 9.Bf4xd6 Re8xe6
10.Re1xe6
  +-  (1.58)   Depth: 13/13   00:00:00  27kN
5.Bh6-f4 Kg6-g7 6.b2-b4 h7-h5 7.g2-g3 b6-b5 8.Bd5-e6 Rc8-d8 9.d4-d5 Nc6-e5
10.Nf3xe5 f6xe5 11.Re1xe5 Be7-d6 12.Re5xf5 Bd6xf4 13.Rf5xf4
  +-  (1.62)   Depth: 14/24   00:00:02  738kN
5.Bh6-f4 Kg6-g7 6.b2-b4 b6-b5 7.Re1-c1 Nc6-b8 8.Rc1xc8 Re8xc8 9.Nf3-h4 Kg7-f8
10.Bd5-b7 Rc8-c3 11.Nh4xf5 Nb8-c6 12.a3-a4 Nc6xb4 13.a4xb5
  ±  (1.38)   Depth: 15/26   00:00:07  2369kN
5.Bh6-f4 Nc6xd4 6.Nf3xd4 Be7xa3 7.Re1xe8 Rc8xe8 8.Nd4-f3 Ba3xb2 9.Nf3-h4+ Kg6-g7
10.Kg1-f1 a7-a5 11.Nh4xf5+ Kg7-f8 12.Nf5-d6 Kf8-e7
  ±  (1.33)   Depth: 16/30   00:00:23  7471kN
5.Bh6-f4 Nc6xd4 6.Nf3xd4 Be7xa3 7.Re1xe8 Rc8xe8 8.g2-g4 Ba3xb2 9.g4xf5+ Kg6-g7
10.Nd4-e6+ Kg7-h8 11.Kg1-f1 Re8-c8 12.Kf1-e2 Rc8-c2+ 13.Ke2-e3 a7-a5
  ±  (1.31)   Depth: 17/32   00:00:43  15168kN
5.Bh6-d2 Kg6-g7 6.Bd2-f4 h7-h5 7.b2-b4 b6-b5 8.Bd5-e6 Rc8-d8 9.d4-d5 Nc6-b8
  ±  (1.32)   Depth: 17/43   00:00:53  19035kN
5.Bh6-d2 Kg6-g7 6.Bd2-f4 b6-b5 7.Bd5-e6 Rc8-d8 8.d4-d5 Nc6-e5 9.Nf3-d4 Ne5-d3
10.Be6xf5 Nd3xe1 11.Nd4-e6+ Kg7-f7 12.Ne6-g5+ f6xg5 13.h2-h4 g5xf4
  ±  (1.32)   Depth: 17/43   00:01:03  22267kN
5.Bh6-d2 Kg6-g7 6.b2-b4 b6-b5 7.Bd5-e6 Rc8-d8 8.d4-d5 Nc6-e5 9.Nf3-d4 Ne5-c4
10.Bd2-c1 Nc4-e5 11.Nd4xb5 Ne5-d3 12.Re1-f1 Nd3xc1
  +-  (1.43)   Depth: 18/36   00:02:07  44465kN
5.Bh6-d2 Kg6-g7 6.b2-b4 h7-h5 7.Bd2-f4 b6-b5 8.Re1-c1 Nc6-b8 9.Rc1xc8 Re8xc8
10.Nf3-h4 Kg7-f8 11.Nh4xf5 Be7xb4 12.a3xb4
  +-  (1.63)   Depth: 19/36   00:03:26  71268kN
5.Bh6-d2 Kg6-g7 6.b2-b4 h7-h5 7.Re1-c1 Nc6-b8 8.Rc1xc8 Re8xc8 9.Nf3-h4 Be7-f8
10.Nh4xf5+ Kg7-g6 11.Bd5-e4 Rc8-d8 12.Bd2-f4 Kg6-f7 13.d4-d5 Rd8-e8 14.f2-f3
a7-a5 15.b4xa5
  +-  (1.69)   Depth: 20/38   00:06:04  127926kN
5.Bh6-d2 Kg6-g7 6.b2-b4 a7-a5 7.Re1-e6 Nc6-d8 8.Re6xb6 a5xb4 9.a3xb4 Rc8-c2
10.h2-h4 Rc2-b2 11.g2-g3 Nd8-f7 12.Bd5-c6 Re8-c8 13.Kg1-h2
  +-  (1.69)   Depth: 21/40   00:10:18  218263kN
5.Bh6-d2 Kg6-g7 6.b2-b4 a7-a5 7.Re1-e6 Nc6-d8 8.Re6xb6 a5xb4 9.a3xb4 Rc8-c2
10.h2-h4 Rc2-b2 11.g2-g3 h7-h5 12.b4-b5 Be7-b4 13.Bd2-e3 Nd8-c6
  +-  (1.84)   Depth: 22/41   00:17:10  366131kN, tb=1
5.Bh6-d2 Kg6-g7 6.b2-b4 a7-a5 7.Re1-e6 Nc6-d8 8.Re6xb6 a5xb4 9.a3xb4 Rc8-c2
10.h2-h4 Rc2-b2 11.g2-g3 h7-h5 12.b4-b5 Be7-b4 13.Bd2-e3 f5-f4 14.Be3xf4
  +-  (1.79)   Depth: 23/44   00:29:23  635510kN, tb=1
5.Bh6-d2 Kg6-g7 6.b2-b4 a7-a5 7.Re1-e6 Nc6-d8 8.Re6xb6 a5xb4 9.a3xb4 Rc8-c2
10.g2-g3 Nd8-f7 11.Kg1-g2 Nf7-d6 12.Bd5-c6 Re8-c8 13.b4-b5
  +-  (1.76)   Depth: 24/46   00:55:18  1220985kN, tb=1
5.Bh6-d2 Kg6-g7 6.Bd2-f4 b6-b5 7.g2-g3 a7-a6 8.Kg1-g2 Nc6-a5 9.Bd5-e6 Rc8-c6
10.Be6-d7 Re8-d8 11.Re1xe7+ Kg7-f8 12.Bd7xc6 Kf8xe7 13.d4-d5
  +-  (2.01)   Depth: 25/44   02:02:56  2697532kN, tb=4
5.Bh6-d2 Kg6-g7 6.Bd2-f4 b6-b5 7.g2-g3 b5-b4 8.Kg1-g2 a7-a5 9.Bd5xc6 Rc8xc6
10.d4-d5 Rc6-c8 11.d5-d6 b4xa3 12.d6-d7 Be7-f8 13.Re1xe8
  +-  (2.36)   Depth: 25/47   02:26:20  3183940kN, tb=4



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