1.Nf3 f6 2.e3 e6 3.Nd4 c6 4.Nb5 cxb5

Now the white queen will try to slide into black's position, which will be easier now that the c6 pawn is gone, so 5.Qh5+ g6 6.Qb5 Nc6 7.Qb6 Kf7.

If 7...axb6, 8.Bb5 Kf7 9.Bxd7; 9...Rxa2 10.b4 should be winning for white and 9...Nh6 10.h3 Rxa2 11.b4 Ng4 12.hxg4 h5 and white is better.

If 7...Qxb6 then 8.Bb5 Kf7 9.Nc3 Bb4 10.d4 and white is a pawn up.