Chess puzzle (Checkmate)
Moves: 1. c4 e5 2. Nc3 Bc5 3. g3 Nc6 4. a3 Qf6 5. b4 *
Position (FEN): r1b1k1nr/pppp1ppp/2n2q2/2b1p3/1PP5/P1N3P1/3PPP1P/R1BQKBNR b KQkq - 0 5
Black to move.
Themes: Attacking f2 or f7 Opening Mate in 1 
Puzzle rating: 803
Best move: Qxf2#