Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. Nc3/4...fxe4/5. Nxe4/5...d5/6. Nxe5/6...dxe4/7. Nxc6/7...Qd5/8. c4/8...Qd6/9. Qh5/9...g6

The usual move here is
 * 10. Qe5+, when after the forcing sequence 10...Qxe5 11.Nxe5+ c6 12.Ba4 Bg7 13.d4 exd3 White can simply recapture with
 * 14.Nxd3 and try to untangle her queenside and convert the extra pawn, or alternatively:
 * 14.O-O (to meet ...Bxe5 with Re1 winning the bishop pair) and then 14...Bxe5 15.Re1 is simple enough, but with either 14...Be6 or 14...Bf5 Black can challenge White to the very very long variation:
 * 15.Nxc6 Bd7 16.Re1+ Kf8 17.Nd4! Bxa4 18.Ne6+ Kf7 19.Nxg7 Kxg7 20.b3 Be8 21.Bb2+ Nf6 22.Re7+ Bf7 23.g4 g5 24.f4 gxf4 25.g5 and White has at last won the piece back with, well, approximately a drawn position.
 * 15.Re1 is probably the sane option.
 * 10. Nxa7+ offers to transpose to the 9.Nxa7+ lines, which Black can accept with 10...Bd7 11.Bxd7 Qxd7 12.Qe5+. Since those lines are mostly terrible, Black may be objectively better off with 10...c6, leading to 11.Nxc8 and then either 11...gxh5 12.Nxd6+ Bxd6 or 11...Rxc8 12.Qh3 Ra8, neither of which have been tested by theory.