1.Nf3 f6 2.Nd4 Nh6 3.Nf5 Nxf5 4.e4

Black can play 4...e6 or 4...g6 5.d4 e6 (if 5...d5 then 6.e5 Na6 7.b4) 6.Bc4 (or 4.Bd3) Bb4 7.c3 Bxc3 8.Qd2 h5.