1.Nf3 f6 2.e3 e6 3.Nd4 f5 4.Qh5+ g6 5.Qg5 Qxg5 6.Nb5

Black can choose between:

6...Nf6 7.f3 (or 7.Bd3; 7.d3; 7.g4) Ne4 (or 7...Bg7) 8.fxe4 (or 8...a6 9.Nxc7 f4 10.Bd3) Bb4 9.Nc3 (or 9.c3),

6...Bg7,

6...Bb4 7.c3 Nf6 8.f3 Ne4 9.fxe4 a6 10.Nxc7; white is two pieces up but black has an attack on the f-file,

6...a6 7.Nxc7 Nf6 8.g4 Bb4 (or 8... fxg4 9.f4 Ne4 10.d3 Nd2 11.Bg2 Nxb1 12.Bxb7) 9.Nc3 fxg4 10.f4 Ng4 11.h4.