Chess puzzle (Advantage)
Opening: Vienna_Game, Vienna_Game_Falkbeer_Variation
Moves: 1. e4 e5 2. Nc3 Nf6 3. Nd5 Nxe4 4. Qg4 f5 *
Position (FEN): rnbqkb1r/pppp2pp/8/3Npp2/4n1Q1/8/PPPP1PPP/R1B1KBNR w KQkq - 0 5
White to move.
Themes:  Opening  
Puzzle rating: 1629
Best move: Qxf5