Chess Opening Theory/1. e4/1...a6/2. Bc4/2...b5/3. Bxf7/3...Kxf7/4. Qh5

= St. George Defence = Among the three legal moves, two lead to quick checkmate :


 * 4...Kf6 5. Qf5#
 * 4...Ke6 5. Qd5+ Kf6 6. Qf5#

So, Black will play /4...g6/.

Theory table
.

'1.e4 a6 2.Bc4 b5 3.Bxf7+ Kxf7 4.Qh5+'