Chess Opening Theory/1. e4/1...e5/2. Bc4/2...Bc5/3. Qh5/3...Nc6

3...Nc6??

	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

After 3...Nc6??

The last move for black. He had not seen the threat of 4.Qxf7#.

Theory Table

1. e4 e5 2. Bc4 Bc5 3. Qh5 Nc6??

	... ...	4.Qxf7#