Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Bc5/5. Nxf7/5...Bxf2/6. Kf1

6. Kf1
The bishop sacrifice is declined, not allowing Nxe4 with check. The position is now very unclear and both sides must play precisely to maintain their initiative. In addition, a fight for the center will likely play a big factor in the game for the next couple of moves.

Black should save their queen with its only move: 6...Qe7.