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Subject: Question for chess experts

Author: Gian-Carlo Pascutto

Date: 12:13:58 03/20/02

In the Dutch championship 2001, my program reached the following
position with black against Rebel Century

[D]r2q1rk1/pbp1bppp/1p2pn2/8/3P1B2/2PB1N2/PP2QPPP/R4RK1 b - - 0 1

It played the losing move a5?, and proceeded with the 'plan' of
pushing it further along the a-file.

Nowadays, it would find the correct c5 after about a minute
of search, but it is clear by looking at the variations that
it is more due to luck and that it is still not really understanding
what is going on.

I am wondering if one of the strong players is able to explain
why c5 is good and a5 is not. I would play c5 myself, but I
have to admit I would not be able to explain why it is better
either. I just know it is good to hit at the d4 pawn with the
c pawn if possible, but I suspect there is more to it?

Analysis by Sjeng 12.10:

11...Qd7 12.Rfe1
  ²  (0.33)   Depth: 2   00:00:00
11...c5 12.dxc5 Bxc5
  =  (0.23)   Depth: 2   00:00:00
11...c5 12.dxc5 Bxc5
  =  (0.23)   Depth: 2   00:00:00
11...c5 12.dxc5 Bxc5 13.Rad1
  ²  (0.39)   Depth: 3   00:00:00
11...Qd7 12.Ne5 Qa4
  ²  (0.34)   Depth: 3   00:00:00
11...Nd5 12.Bd2 Qd7
  =  (0.23)   Depth: 3   00:00:00
11...Nd5 12.Bd2 Qd7
  =  (0.23)   Depth: 3   00:00:00
11...Nd5
  ±  (0.73)   Depth: 4/16   00:00:00
11...Qd7 12.Ne5 Qd5 13.f3
  ²  (0.42)   Depth: 4/16   00:00:00
11...c5 12.dxc5 Bxc5 13.Rad1 Qd7
  =  (0.19)   Depth: 4/16   00:00:00
11...c5 12.dxc5 Bxc5 13.Rad1 Qd7
  =  (0.19)   Depth: 4/16   00:00:00
11...c5 12.dxc5 Nd5 13.Be5 Bxc5
  =  (0.25)   Depth: 5/16   00:00:00
11...a6 12.Rad1 Nd5 13.Qe4 Nxf4 14.Qxb7
  =  (0.22)   Depth: 5/16   00:00:01
11...a6 12.Rad1 Nd5 13.Qe4 Nxf4 14.Qxb7
  =  (0.22)   Depth: 5/21   00:00:01
11...a6 12.Rfd1 Bd6 13.Ne5 c5 14.Bc2
  ²  (0.26)   Depth: 6/21   00:00:01  391kN
11...a6 12.Rfd1 Bd6 13.Ne5 c5 14.Bc2
  ²  (0.26)   Depth: 6/21   00:00:02  616kN
11...a6 12.Rad1 Qd7 13.Rfe1 Nh5 14.Bd2 Nf6
  =  (0.20)   Depth: 7/21   00:00:03  1295kN
11...a5 12.Rfe1 Bd6 13.Ne5 c5 14.Qe3 Qe7
  =  (0.19)   Depth: 7/23   00:00:04  1995kN
11...a5 12.Rfe1 Bd6 13.Ne5 c5 14.Qe3 Qe7
  =  (0.19)   Depth: 7/24   00:00:05  2455kN
11...a5 12.Rfd1 a4 13.Ne5 a3 14.b3 Qd5 15.f3
  =  (0.20)   Depth: 8/24   00:00:08  4809kN
11...a5 12.Rfd1 a4 13.Ne5 a3 14.b3 Qd5 15.f3
  =  (0.20)   Depth: 8/27   00:00:09  5339kN
11...a5 12.Rfe1 a4 13.Bc2 a3 14.b3 Nd5 15.Qe4 Nxf4 16.Qxb7
  =  (0.18)   Depth: 9/27   00:00:26  16234kN
11...a5 12.Rfe1 a4 13.Bc2 a3 14.b3 Nd5 15.Qe4 Nxf4 16.Qxb7
  =  (0.18)   Depth: 9/31   00:00:34  20026kN
11...a5 12.Rfe1 a4 13.b4 a3 14.Ne5 Qd5 15.f3 Nd7 16.Qf2 Nxe5 17.Rxe5
  =  (0.21)   Depth: 10/31   00:00:52  33182kN
11...c5 12.dxc5 Bxc5 13.Rad1 Qe7 14.Rd2 Rfd8 15.Rfd1 Rac8 16.Bc4 Rxd2 17.Rxd2
  =  (0.13)   Depth: 10/31   00:01:35  63374kN
11...c5 12.dxc5 Bxc5 13.Rad1 Qe7 14.Rd2 Rfd8 15.Rfd1 Rac8 16.Bc4 Rxd2 17.Rxd2
  =  (0.13)   Depth: 10/31   00:01:40  64914kN

--
GCP

Re: Question for chess experts Marc van Hal 08:44:05 03/21/02
Re: Question for chess experts Miguel A. Ballicora 21:35:55 03/20/02
- Re: Question for chess experts Jeroen Noomen 09:07:27 03/21/02
  - Re: Question for chess experts Miguel A. Ballicora 13:13:07 03/21/02
  - Re: Question for chess experts Telmo Escobar 11:42:45 03/21/02
    - Re: Question for chess experts Jeroen Noomen 12:12:32 03/21/02
      - Re: Question for chess experts Marc van Hal 12:30:09 03/21/02
Re: Question for chess experts Telmo Escobar 20:45:12 03/20/02
Re: Question for chess experts José Carlos 15:20:28 03/20/02
Re: Question for chess experts martin fierz 15:14:26 03/20/02
Re: Question for chess experts ALI MIRAFZALI 13:21:28 03/20/02
- Re: Question for chess experts Jason Williamson 15:46:49 03/20/02
- Re: Question for chess experts José Carlos 14:22:15 03/20/02
- Re: Question for chess experts Gian-Carlo Pascutto 13:39:26 03/20/02
  - Re: Question for chess experts ALI MIRAFZALI 14:01:50 03/20/02
    - Re: Question for chess experts Dann Corbit 14:14:33 03/20/02
- Re: Question for chess experts Dann Corbit 13:29:26 03/20/02
  - Re: Question for chess experts ALI MIRAFZALI 14:13:26 03/20/02
    - Re: Question for chess experts Dann Corbit 14:17:28 03/20/02
  - Re: Question for chess experts James T. Walker 13:49:10 03/20/02
    - Re: Question for chess experts Dann Corbit 14:05:09 03/20/02
      - Re: Question for chess experts James T. Walker 14:28:24 03/20/02
Re: Question for chess experts Albert Silver 13:13:45 03/20/02
- Re: Question for chess experts Aaron Tay 13:39:26 03/20/02
  - Re: Question for chess experts Albert Silver 13:53:26 03/20/02
Re: Question for chess experts Jeroen Noomen 12:45:47 03/20/02
- Re: Question for chess experts Marc van Hal 13:12:43 03/20/02
Re: Question for chess experts Marc van Hal 12:30:45 03/20/02

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