Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Modern_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. Nf3 Bb4 6. a3 Bxc3+ 7. bxc3 dxc4 8.
e4 h6 9. Bh4 g5 10. Nxg5 hxg5 11. Bxg5 e5 12. Bxc4 Qe7 13. O-O Nb6 14. Bb3 Bd7
15. dxe5 Bg4 16. f3 Qc5+ 17. Kh1 Nxe4 18. fxg4 *
Position (FEN): r3k2r/ppp2p2/1n6/2q1P1B1/4n1P1/PBP5/6PP/R2Q1R1K b kq - 0 18
Black to move.
Themes: Pin Middlegame Mate in 1 
Puzzle rating: 1711
Best move: Ng3#