1.Nf3 f6 2.Nd4 Nh6 3.Nf5 Nxf5 4.Nc3 c6 5.d4

Possible continuations are:

5...d5 6.e4 b5 7.h3 h5,

5...g6 6.e4 b5 7.h3 h5,

5...e6 6.e4 h5 (or 6...g6 7.Nb5 cxb5 8.Bb5 Nc6 9.c3 g6) 7.f4 Bb4 8.f5 d5 9.h4 g5.