1.Nf3 f6 2.Nd4 Nh6 3.Nf5 Nxf5 4.Nc3 c6 5.e4 g6

White's main move is 6.d4 e5 (or 6...b5, 6...e6, 6...d6, 6...Bh6 7.Bg5 Na6) 7.Nb5 cxb5 8.Bb5 Nc6 9.c3.

Another line: 6.Nd5 cxd5 7.Bb5 Nc6 8.d4