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

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:
6. Nxe5 - Main Line
6. Ng3 - Showalter Variation

This is a great time to dynamite Black's proud pawn centre with 6. Nxe5! White comes out of the resulting tactics in good shape.

6. Ng3 isn't exactly a bad move, and Black still has to do something about the threat to the e-pawn, but who wants to let Black play ...e5 and ...d5 in the first 5 moves and get away with it?

Wikipedia has related information at Ruy_Lopez#Schliemann_Defence:_3...f5.