Chess puzzle (Advantage)
Opening: Vienna_Game, Vienna_Game_Vienna_Gambit
Moves: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 Nf6 5. e5 Bb4 *
Position (FEN): r1bqk2r/pppp1ppp/2n2n2/4P3/1b3p2/2N2N2/PPPP2PP/R1BQKB1R w KQkq - 1 6
White to move.
Themes:  Opening  
Puzzle rating: 1275
Best move: exf6