1.Nf3 f6 2.Nd4 Nh6 3.g4 c6 4.d3

A possible line is 4...e5 5.Nf5 Nxf5 (5...Nxg4 6.Bh3 f5 7.Bg5 Qb6 or 7...Qa5+ unclear but white could be winning) 6.e4 d5 7.h4.