Chess Opening Theory/1. e4/1...e5/2. Nc3/2...Bc5/3. Na4

3. Na4?!
This move attacks the bishop, but it allows 3...Bxf2+!, a sacrifice, which leads to wild complications favouring Black after 4. Kxf2 Qh4+ 5. Ke3 Qf4+ 6. Kd3 d5, as in the famous game between Hamppe and Meitner.