1.Nf3 f6 2.Nc3 Nh6

White can play:

3.g4,

3.Ne5 fxe5 4.h3 (4.Nd5 seems winning but 4...e6 or 4..e5 and black is fine) e6 5.d4 Bb4 (or 5...Qf6),

3.h3 Ng4 (or 3...c6 4.Ne5 fxe5 and white has a strong attack) 4.hxg4 c6 5.e4 (or 5.d4) g6 6.d4 Bh6 7.Bg5.