Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Other_variations
Moves: 1. e4 Nc6 2. Bc4 d6 3. Nf3 e5 4. Bxf7+ *
Position (FEN): r1bqkbnr/ppp2Bpp/2np4/4p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 0 4
Black to move.
Themes: Hanging Piece Opening  
Puzzle rating: 646
Best move: Kxf7