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Subject: Re: Testposition - The Magnet

Author: Ernst Walet

Date: 04:51:43 03/11/01

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On March 11, 2001 at 05:28:55, Sune Larsson wrote:

>
>  [D]2r2rn1/p3q1bk/n2p2pp/1b1PPp2/1pp2P1N/1P2N1P1/P1QB2BP/4RRK1 w - - 0 1
>
>  Selinski-Sotorenko, corr 1974
>
>
>  Somehow my mind went back to the old Evans Gambit. I was raised with
>  this gambit (and others), which provided the tense and fireworks needed
>  for my age. But the old love never dies and the skipper still smiles
>  from his heaven above. Anyway, tactics is the name of the game, and
>  here is a nice position from a Russian corr game.
>
>  A lot of tension and options, as you can see. White has to keep an eye
>  on the e5-pawn, which is under attack, and moves like 1.-c3 or 1.-cxb3.
>  He found a nice way of forcing the black king into a land of danger and
>  death. Pushed further and further towards the guillotine. Strong, almost
>  magnetic forces are working here, which formes the name of this theme:
>  The Magnet. Or if you prefer it this way: "Hi there big fellow - care to
>  join me for a cup of coffee?" ;)
>
>
>  Test: White to move and win. Let's go for the king! Some clues further down.
>        White might have some other promising continuations here, but we
>        assume that Selinski's choice is the most straight forward.
>
>  Sune
>
>
>
>
>
>
>
>Selinski - Sotorenko
>Fernpartie, 1974
>
>1.Nxg6! Kxg6 2.Nxf5! Rxf5 3.Qxf5+! Kxf5 4.Be4+ Kg4 5.h3+ Kxg3
>
>[5...Kxh3 6.Bf5+ Kxg3 7.Re3+ Kh4 8.Rh3#;
> 5...Kh5 6.g4+ Kh4 7.Re3]
>
>6.Re3+ Kh4 7.Bg6 Qg5+ 8.fxg5 Bxe5 9.Re4+ Kxh3 10.Bf5+ Kg3 11.Be1# 1-0

Fritz6 has no clue, but Nimzo8 plays the keymove in 50 seconds.

New position
2r2rn1/p3q1bk/n2p2pp/1b1PPp2/1pp2P1N/1P2N1P1/P1QB2BP/4RRK1 w - - 0 1

Analysis by Nimzo 8:

1.a3
  µ  (-0.88)   Depth: 1/11   00:00:01
1.a4
  µ  (-0.85)   Depth: 1/11   00:00:01
1.a4
  ³  (-0.51)   Depth: 1/11   00:00:01
1.e6
  ±  (0.89)   Depth: 1/11   00:00:01
1.e6
  ±  (0.89)   Depth: 1/11   00:00:01
1.bxc4
  ±  (0.93)   Depth: 1/11   00:00:01
1.bxc4
  ±  (1.24)   Depth: 1/11   00:00:01
1.exd6
  ±  (1.37)   Depth: 1/11   00:00:01
1.exd6
  +-  (1.74)   Depth: 1/11   00:00:01
1.exd6 Qxd6 2.Nxc4 Qc5+ 3.Be3 Bd4
  ±  (1.38)   Depth: 3/14   00:00:01
1.exd6 Qxd6 2.Nxc4 Bd4+ 3.Be3 Bxe3+ 4.Rxe3 Qc5 5.Rfe1
  +-  (1.59)   Depth: 5/17   00:00:01
1.bxc4
  +-  (1.60)   Depth: 5/17   00:00:01
1.exd6 Qxd6 2.Nxc4 Bd4+ 3.Be3 Bxe3+ 4.Rxe3 Qc5 5.Rfe1
  +-  (1.59)   Depth: 5/17   00:00:01
1.Nexf5
  +-  (1.60)   Depth: 5/17   00:00:01
1.Nexf5
  +-  (2.20)   Depth: 5/17   00:00:01
1.Nexf5 cxb3 2.Qe4 Nc5 3.Nxe7 Nxe4 4.Nxc8
  +-  (3.41)   Depth: 5/17   00:00:02
1.Nexf5 cxb3 2.Qe4 Qd7 3.Nxd6 Bxf1 4.Bxf1 Rc2
  +-  (3.25)   Depth: 6/19   00:00:02
1.Nexf5
  +-  (2.80)   Depth: 7/20   00:00:03  672kN
1.Nexf5 cxb3 2.Qxc8 gxf5 3.Bh3 Bxe5 4.Bxf5+ Kg7 5.Rxe5 dxe5
  +-  (2.30)   Depth: 7/20   00:00:04  1053kN
1.bxc4
  +-  (2.31)   Depth: 7/20   00:00:08  2127kN
1.bxc4
  +-  (2.91)   Depth: 7/20   00:00:11  3556kN
1.bxc4 Qe8 2.Qd3 Ba4 3.exd6 Qd8 4.d7 Bxd7
  +-  (3.00)   Depth: 7/20   00:00:17  5744kN
1.bxc4 Qe8 2.Nf3 dxe5 3.Nxe5 Bxe5 4.fxe5 Qxe5 5.Qd1 Bd7 6.Nxf5
  +-  (3.08)   Depth: 8/22   00:00:25  8577kN
1.Nxg6
  +-  (3.09)   Depth: 8/22   00:00:29  9718kN
1.bxc4 Qe8 2.Nf3 dxe5 3.Nxe5 Bxe5 4.fxe5 Qxe5 5.Qd1 Bd7 6.Nxf5
  +-  (3.08)   Depth: 8/22   00:00:30  10451kN
1.bxc4 Qe8 2.Nf3 dxe5 3.Nxe5 Bxe5 4.fxe5 Qxe5 5.Qd1 Bd7 6.Nxf5
  +-  (3.00)   Depth: 9/23   00:00:46  15879kN
1.Nxg6
  +-  (3.01)   Depth: 9/23   00:00:50  17390kN
1.Nxg6
  +-  (3.61)   Depth: 9/23   00:00:52  18507kN
1.Nxg6 cxb3 2.Nxf8+ Qxf8 3.Qxf5+ Qxf5 4.Nxf5 Bxf1 5.Bxf1 Rc2 6.Be3
  +-  (4.60)   Depth: 9/23   00:01:04  22809kN
1.Nxg6 cxb3 2.Nxf8+ Qxf8 3.Qxf5+ Qxf5 4.Nxf5 Bxf1 5.Bxf1 Rc2 6.Be3
  +-  (4.33)   Depth: 10/25   00:01:29  32896kN
1.Nxg6 cxb3 2.Nxf8+ Qxf8 3.Qxf5+ Qxf5 4.Nxf5 Bxf1 5.Bxf1 Rc2 6.Be3
  +-  (4.40)   Depth: 11/26   00:02:45  62244kN
1.Nxg6 cxb3 2.Nxf8+ Qxf8 3.Qxf5+ Qxf5 4.Nxf5 Bxf1 5.Bxf1 Rc2 6.Be3
  +-  (4.39)   Depth: 12/28   00:06:14  143649kN

(PIII-500E, 128MB hash, 3 and 4 men EGTB, 11.03.2001)

Ernst.



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