Author: Marc van Hal
Date: 13:12:43 03/20/02
Go up one level in this thread
On March 20, 2002 at 15:45:47, Jeroen Noomen wrote: >On March 20, 2002 at 15:13:58, Gian-Carlo Pascutto wrote: > >Hi Giancarlo, > >c7-c5 is a typical move in such positions. If you look >at it closely, it has the following purposes: > >1. Gaining territory on the queen's side and in the centre >2. Attacking the strong white centre pawn, which (when not > guarded by a piece) can become an isolated pawn >3. As a result of this, the black bishop can get more scope: > If white exchanges dxc5, black retakes with Be7 and has > activated his bishop >4. The c-file can be opened, where black can aim his > counterplay at. F.e. by moving the rook to c8. >5. By attacking the white centre, black makes sure that white > 'cannot do whatever he wants'. >6. It is clear that the pro's of black's position lie in his > solid - albeit a bit passive - position, the pieces are > watching the centre and a typical black plan can be a > minority attack on the queen's side with c5, a6 and b5 etc. > >All in all c5 is an active move, matching the demands of the >position. > >I think with the above advantages of the move c7-c5 it is also >clear why a5? is a bad move. It does nothing the move c7-c5 >accomplishes. Thus, it is only a waste of time, giving white >the opportunity 'to do what he wants'. And Rebel did :-) > >Best regards, Jeroen > >Well ad both understandings Jeroen''s and mine and And that a5 actualy costs a tempo trying to archieve the same goal Solving the posible trouble on the c-file. and you have the corect answer. regards Marc > > >>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
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