I have neen playing a higher amount of online chess as opposed to club chess lately and something I have noticed is a significant increase in Bishop sacrifices to prevent kingside castling. Here is an example.
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 1. e4 e5 2. Bc4 Nf6 3. Nf3 Nc6 4. O-O Bc5 5. Bxf7+
The above is probably the most common instance I have come across of this "tactic" being used..Is sacrificing the minor piece really worth it? Is there name for this tactic, eg "Fianchetto"?