Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. Nc3/4...fxe4/5. Nxe4/5...Nf6/6. Qe2/6...d5/7. Nxf6

Ruy Lopez, Schliemann Defence

	a	b	c	d	e	f	g	h
8									8
7									7
6									6
5									5
4									4
3									3
2									2
1									1
	a	b	c	d	e	f	g	h

Common moves:
7...gxf6 - only move

It's check, and 7...gxf6 is necessary to regain the piece. 7...Qxf6 would be a bad way to sacrifice the e-pawn because White wouldn't be forced to give up the bishop pair in order to capture it (as she would after 6.Nxf6+ Qxf6 7.Qe2 Be7).