1.e4
e5
2.Bc4
Nf6
3.d3
c6
The idea is ...d5
4.Nf3
d5
5.Bb3
Bd6
Defending e5
6.Nc3
Beginning to pressure the black center
6...Be6
7.Bg5
Qa5
8.0-0
Nbd7
9.exd5
cxd5
10.Re1
Diagram Is black OK, or is the center crumbling?
10...0-0
[10...0-0-0
11.Qd2
reached by East German master Koch in correspondence games in the 1960s, winning all four with white. 11...Bc7
(11...Kb8
12.Bxf6
gxf6
13.Nxd5
Qa6
14.Ne3
Nc5
15.Bxe6
fxe6
16.Qe2
; 11...Qb6
12.Bxf6
Nxf6
13.Nxe5
d4
14.Bxe6+
fxe6
15.Nc4
Bxh2+
16.Kxh2
Qc7+
17.Kg1
dxc3
18.Qxc3
; 11...Bb4
12.a3
Bxc3
13.Qxc3+
Qxc3
14.bxc3
h6
15.Bh4
g5
16.Bg3
e4
17.Nd4
) 12.Bxf6
gxf6
13.Bxd5
Bxd5
14.b4
Qxb4
15.Nxd5
Qxd2
16.Nxd2
Ba5
17.Re2
Bxd2
18.Rxd2
Rhe8
19.f4
Re6
20.Rf1
e4
21.dxe4
Rxe4
22.Nc3
Rb4
23.a3
Rb6
24.Rfd1
f5
25.a4
Koch-Muller]
11.Qd2
Ne8
12.Nxd5
Qxd2
13.Bxd2
1-0