Chess Opening Theory/1. e4/1...e5/2. Bc4/2...Bc5/3. Qh5/3...Nf6

	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

3...Nf6??

This will be Black's last move. He, in his hotheaded desire to take White's queen and develop his knight, has not seen the threat of Qxf7#(Scholar's Mate).