1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.c3 dxc3
5.Nxc3 Nc6 6.Bc4 Nf6 7.e5 Ng4 8.e6 f6 9.Bf4 (O-O)




FIG. 25

(7...d5, 7...Nxe5, 7...dxe5)

After 9.Bf4, play could proceed as 9...g6 10.Nd4 Nge5 (Nxd4)11.Bxe5 de (11...fe 12.Qf3) 12.Nxc6 Qxd1+
13.Rxd1 bc 14.Nb5 !



FIG. 26

Black must lose his rook to avoid mate.