1.Nh3 f6 2.e4 d5 3.Na3 b5 4.d4 Nh6 5.Bxh6

The main move is 5...Bg4. Other lines are:

5...Bxh3 6.f4 c5 7.e5 h5 8.h4 and black can choose 8...e6, 8...Bh6 or 8...d6,

5...g6 6.c3 Bh6 7.Ng5 hxg5,

5...e5.