Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Smith-Morra_Gambit
Moves: 1. e4 c5 2. d4 d5 3. exd5 Qxd5 4. Nf3 Nc6 5. c4 Qe4+ 6. Be2 Nxd4 7. Nc3 Nxf3+
8. gxf3 Qc6 9. Qd5 Bd7 10. Bf4 O-O-O 11. Nb5 Qxd5 *
Position (FEN): 2kr1bnr/pp1bpppp/8/1Npq4/2P2B2/5P2/PP2BP1P/R3K2R w KQ - 0 12
White to move.
Themes: Queenside Attack Middlegame Mate in 1 
Puzzle rating: 998
Best move: Nxa7#