Chess puzzle (Checkmate)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Old_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e3 e6 4. Bxc4 Ne7 5. Nc3 g6 6. Ne4 Nbc6 *
Position (FEN): r1bqkb1r/ppp1np1p/2n1p1p1/8/2BPN3/4P3/PP3PPP/R1BQK1NR w KQkq - 2 7
White to move.
Themes:  Opening Mate in 1 
Puzzle rating: 914
Best move: Nf6#