Chess puzzle (Checkmate)
Opening: Alekhine_Defense, Alekhine_Defense_Two_Pawns_Attack
Moves: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. d4 d6 5. Nf3 Bf5 6. Nc3 Nc6 7. Qb3 Na5 8. Qb5+
Nc6 9. d5 a6 10. Qb3 Na5 11. Qd1 Naxc4 12. Bxc4 Nxc4 13. Qa4+ b5 14. Nxb5 Nb6 *
Position (FEN): r2qkb1r/2p1pppp/pn1p4/1N1PPb2/Q7/5N2/PP3PPP/R1B1K2R w KQkq - 1 15
White to move.
Themes: Double Check Opening Mate in 1 
Puzzle rating: 574
Best move: Nxd6#