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Subject: Re: A position: What does your favourite engine say?

Author: Andrew Smith

Date: 11:53:11 01/16/02

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On January 16, 2002 at 11:17:11, Matthew Barnett wrote:

>[D]r6r/1b1n1pk1/p3p1pR/1p1pP1P1/2q2P2/P1N2B2/1PP4Q/2KR4 w - - 0 24
>
>Here, in a correspondence game, I played Nxd5 and went on to win.  I'm trying to
>work out how good it is against the other more obvious move, Rh1.  Personally, I
>think it is at least as good as Rh1, if not better (that's why I played it at
>the time!) although the dividends aren't really seen until the endgame.
>
>When it comes to using Deep Fritz (Athlon 1900+ 128MB RAM), it doesn't see the
>possibility for a long, long time.  If I make it analyse the position from Nxd5,
>it likes it much more quickly and by quite a bit after about 18 ply.
>
>Does anyone's engine see Nxd5 reasonably quickly and what do they think of it
>when Nxd5 is played?
>
>Many thanks
>
>Matthew

Crafty goes for f5, with a score that is quite a bit higher than Rh1.

New position
r6r/1b1n1pk1/p3p1pR/1p1pP1P1/2q2P2/P1N2B2/1PP4Q/2KR4 w - - 0 1

Analysis by Crafty 18.10:

1.Rh1 Rxh6 2.Qxh6+
  ±  (0.85)   Depth: 1/10   00:00:00
1.Rh1 Rhc8
  ±  (0.80)   Depth: 2/10   00:00:00
1.Rh1 Rhc8 2.Kb1
  ±  (1.13)   Depth: 3/10   00:00:00
1.Rh1 Rhc8 2.Rh7+ Kf8 3.Kb1
  ±  (1.06)   Depth: 4/10   00:00:00
1.Rh1 Rhc8 2.Rh7+ Kf8 3.Kb1
  +-  (1.46)   Depth: 5/15   00:00:00
1.Rh1 Rhc8 2.Rxg6+ Kf8 3.Rg8+ Ke7 4.Rg7
  +-  (1.54)   Depth: 5/15   00:00:00
1.Rh1 Rhg8 2.Rh7+ Kf8 3.Kb1 Ke8 4.Qd2 Rc8
  ±  (1.29)   Depth: 6/19   00:00:01  116kN
1.Rh1 Rhg8 2.Rh7+ Kf8 3.Kb1 Rc8 4.Be2 Qc5 5.Bg4
  +-  (1.46)   Depth: 7/19   00:00:03  258kN
1.Rh1 Rhg8 2.Rh7+ Kf8 3.Kb1 Rc8 4.Qd2 Rg7 5.Rh8+ Ke7 6.Rxc8 Qxc8
  ±  (1.28)   Depth: 8/19   00:00:08  608kN
1.Rh1 Rhg8 2.Rh7+ Kf8 3.Kb1 Rc8 4.Na2 Ke7 5.Qd2 Nf8 6.Be2
  ±  (1.22)   Depth: 9/23   00:00:32  2445kN
1.Rh1 Rhg8 2.f5 gxf5 3.Rxe6 Kf8 4.Rd6 Rd8 5.Qd2 Kg7 6.Qh2
  +-  (1.46)   Depth: 10/26   00:01:38  7922kN
1.Rh1 Rhg8 2.f5 gxf5 3.Rxe6 Kf8 4.Rd6 Rd8 5.Qd2 Kg7 6.Qh2
  +-  (1.86)   Depth: 11/31   00:06:38  34574kN
1.Rh1 Rhe8 2.Rxg6+ fxg6 3.Qh7+ Kf8 4.Qxd7 Qxf4+ 5.Kb1 Re7 6.Rh8+ Kg7 7.Qxe7+
Kxh8 8.Qxb7 Rf8 9.Be2 d4
  +-  (2.13)   Depth: 11/31   00:12:11  67542kN
1.Rh1 Rhe8 2.Rxg6+ fxg6 3.Qh7+ Kf8 4.Qxd7 Qxf4+ 5.Kb1 Re7 6.Rh8+ Kg7 7.Qxe7+
Kxh8 8.Qxb7 Rf8 9.Be2 d4
  +-  (2.13)   Depth: 12/34   00:17:11  98755kN
1.f5
  +-  (2.53)   Depth: 12/34   00:50:55  309673kN
1.f5 gxf5 2.Rh1 Rhg8 3.g6 Kf8 4.gxf7 Rg5 5.Rh8+ Ke7 6.Rg8 Nxe5 7.Rxa8 Bxa8
8.Qxe5 Kxf7
  +-  (3.04)   Depth: 12/34   01:12:30  451037kN
1.f5 gxf5 2.Rh1 Rhg8 3.g6 Kf8 4.gxf7 Rg5 5.Rh8+ Ke7 6.Rg8 Nxe5 7.Rxa8 Bxa8
8.Qxe5 Kxf7
  +-  (3.44)   Depth: 13/38   01:58:50  773168kN

(only, MyTown 20.11.2001)




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