1.e3 Nf6

The main move for white is 2.Qf3 (pinning the knight; however white has to be careful since ...Ne4 would be strong if black can remove the pin) 2...c6 (with two ideas : (a) avoiding 3.Qxb7 and (b) moving the queen and making d8 free for the king).

Possible lines are:

3.Nh3 (threatening Ng5) Qa5 4.b4 Kd8 5.Qf5 (if 5.bxa5 then 5...Ne4 6.Qxe4) 5...e6 6. bxa5 Ne4 7.Qxe4,

3.Bd3 Qb6 4.Bf5 (or 4.Bg6 Kd8 5.Bf5 e6 6.Qxc6 Ne4 7.Bxe4) e6 5.Qxc6 Ne4 6.Bxe4 and white is a pawn up.