Chess puzzle (Checkmate)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Kennedy_Variation
Moves: 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. Nf3 Qf6 5. Nc3 Bb4 6. Bd2 Ne7 7. a3 Bxc3 8.
Bxc3 d6 9. Be2 O-O 10. Qd2 N7g6 11. O-O-O Be6 12. Nd4 a6 13. Rhf1 Nf4 14. g3
Nxe2+ 15. Nxe2 Qe7 16. f4 Nc4 17. Qd4 b5 *
Position (FEN): r4rk1/2p1qppp/p2pb3/1p6/2nQPP2/P1B3P1/1PP1N2P/2KR1R2 w - - 0 18
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 505
Best move: Qxg7#