Author: Marc van Hal
Date: 12:30:45 03/20/02
Go up one level in this thread
On March 20, 2002 at 15:13:58, Gian-Carlo Pascutto wrote: >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 No anelyses just understanding after a5 the c-file can becomes weak. Looking at positions where Black wants to activate his queensrook Position Queen and bischop on the diogonal f1-a6 the important point garding c8 from there. And keeping it on a8 lowers the valeu of the rook compared to the rooks of the oponent because it i not as mobile! Still Black can make moves which are not to clear to this matter But the basic idea remains. Regards Marc Regards Marc c5 solves this problem
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