Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Bc5/5. Bxf7/5...Ke7/6. Bd5

=Traxler Counterattack=

6.Bd5

 * Bd5 is often given an exclamation mark by theory books. This precise move gives rise to the possibility of a future Bxc6 and overprotects the e4-pawn.

Theory table
.
 * 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5. Bxf7+ Ke7 6. Bd5