Chess Opening Theory/1. e4/1...e5/2. d4/2...exd4/3. c3/3...dxc3/4. Bc4/4...cxb2/5. Bxb2/5...Nf6/6. e5/6...d5/7. exf6/7...Bb4/8. Bc3

= Danish Gambit Accepted, Classical Defence =

8. Bc3
Black is temporarily a piece down, and the bishop on b4 is threatened, so 8...Bxc3+ is necessary.