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Subject: (Probably) very difficult test position.

Author: Steffen Basting

Date: 08:05:35 03/13/03

Hi!
I just played some games against Faile 1.4.4 and came up to the following
position:

[D] r1b1r1k1/1pp1qppN/2n2n1p/p3p3/3P4/2PB4/P5PP/R1BQ1RK1 w - - 0 17

Here, most (in fact all ;-) programs would go for Nxf6, as the score is high
enough (~ +3). I decided to try Rxf6. After playing some variants which were
proposed by Fritz 8, the score always climbed to something > 3, for example
after
1. Rxf6  -  gxf6
2. Qh5   -  e4

Fritz would play:

[D] r1b1r1k1/1pp1qp1N/2n2p1p/p6Q/3Pp3/2PB4/P5PP/R1B3K1 w - - 0 1

Analysis by Fritz 8:
19.Dxh6 exd3 20.Sxf6+ Dxf6 21.Dxf6 Te1+ 22.Kf2 Te2+ 23.Kg3 Le6 24.Lf4
  ±  (1.03)   Tiefe: 7/17   00:00:00  64kN
19.Lc4!
  ±  (1.06)   Tiefe: 7/24   00:00:00  128kN
19.Lc4!
  ±  (1.22)   Tiefe: 7/26   00:00:00  157kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Df4 Kf8
  ±  (1.34)   Tiefe: 7/28   00:00:00  190kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Df4 Kf8
  ±  (1.34)   Tiefe: 8/32   00:00:00  288kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Dh4 Tc8 24.d5
  +-  (1.41)   Tiefe: 9/34   00:00:00  599kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Dh4 Td8 24.Dg3+ Kf8 25.Dxc7
b5
  +-  (1.66)   Tiefe: 10/32   00:00:01  1472kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Df4 Kf8 24.Dxc7 b5
  +-  (1.84)   Tiefe: 11/33   00:00:03  3692kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Df4 Kf8 24.Dxc7
  +-  (1.84)   Tiefe: 12/31   00:00:07  8114kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Df4 Kf8 24.Dxc7
  +-  (2.00)   Tiefe: 13/33   00:00:17  20041kN
19.Lc4 Le6 20.Dxh6 Lxc4 21.Sxf6+ Dxf6 22.Dxf6 Te6 23.Dh4 Td8 24.Tb1 b5 25.Dg3+
  +-  (1.75)   Tiefe: 14/37   00:00:54  63717kN
19.Dxh6!
  +-  (1.78)   Tiefe: 14/40   00:00:59  69485kN
19.Dxh6!
  +-  (1.94)   Tiefe: 14/40   00:01:03  74083kN
19.Dxh6 exd3 20.Sxf6+ Dxf6 21.Dxf6 Te1+ 22.Kf2 Te2+ 23.Kf1 Se7 24.Lg5 c5 25.Df3
c4 26.Te1 Txe1+ 27.Kxe1
  +-  (2.06)   Tiefe: 14/40   00:01:12  83693kN
19.Dxh6!
  +-  (2.34)   Tiefe: 15/42   00:02:06  147570kN
19.Dxh6 exd3 20.Sxf6+ Dxf6 21.Dxf6 Te1+ 22.Kf2 Te2+ 23.Kf1 Se7 24.Lh6 Sf5 25.Lf4
Le6 26.Te1 Txe1+ 27.Kxe1 Sd6 28.Lxd6
  +-  (2.53)   Tiefe: 16/43   00:05:13  365936kN

still with a climbing score.

So, is your program able to find a defense (which means a negative score for
white ;-) after Rxf6?

Thanks for your results,
Steffen

Re: (Probably) very difficult test position. Ingo Bauer 11:11:02 03/13/03
Re: (Probably) very difficult test position. Mike S. 10:44:06 03/13/03
- Re: (Probably) very difficult test position. Steffen Basting 12:13:55 03/13/03

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Last modified: Thu, 15 Apr 21 08:11:13 -0700

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