Chess puzzle (Checkmate)
Opening: Elephant_Gambit, Elephant_Gambit_Paulsen_Countergambit
Moves: 1. e4 e5 2. Nf3 d5 3. exd5 e4 4. Qe2 Nf6 5. Nc3 Bg4 6. Nxe4 Bxf3 *
Position (FEN): rn1qkb1r/ppp2ppp/5n2/3P4/4N3/5b2/PPPPQPPP/R1B1KB1R w KQkq - 0 7
White to move.
Themes: Double Check Opening Mate in 1 
Puzzle rating: 1390
Best move: Nxf6#