1.Nf3 f6 2.e3 e6 3.Nd4 Nh6

The position can be obtained via 1.Nf3 f6 2.Nd4 Nh6 3.e3 e6.

The main line starts with 4.Nb5 Ng4 5.f4 and black can try:

5...Na6 6.Nxc7 Nb4 7.Bb5 Kf7 8.c3 and white is winning,

5...Bb4 6.c3 c6 7.Nxa7 and white is winning (7...Nxh2 8.Qh5+ and the queen will catch the black king),

5...Nf2 6.Qh5+ g6 7.Nxc7 gxh5 and white is winning.

White can also try 4.Qh5+, 4.Nf5, 4.f3 or 4.h3.