7.Qd4 Qf6 8.Qxe4 Qxe5 9.Qxe5+ Nxe5 10.Nd2 d6 11.Nc4 Nxc4 12.Bxc4 Be7 13.O-O O-O 14. Re1 Bf6 15.Be3 Bd7 1/2-1/2 Here is a sharp recent grandmaster game in the 3...f5 line: Hikaru Nakamura - Julio Becerra-Rivero , U.S. Championship 2007 1.e4 e5 2.Nf3 Nc6 3.c3 f5 4.d4 fxe4 5.Nxe5 Nf6 6.Bb5