Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Albin_Countergambit
Moves: 1. d4 d5 2. c4 e5 3. Nc3 exd4 4. Qxd4 Nc6 5. Qd1 d4 6. Nd5 Nf6 7. Nxf6+ Qxf6 8.
Nf3 Bg4 9. Bg5 Bb4+ 10. Bd2 O-O-O 11. Bxb4 Nxb4 12. a3 Nc6 13. Qd3 Rhe8 14.
O-O-O Bf5 15. Qb3 Na5 16. Qb5 Qa6 17. Qxa6 *
Position (FEN): 2krr3/ppp2ppp/Q7/n4b2/2Pp4/P4N2/1P2PPPP/2KR1B1R b - - 0 17
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1436
Best move: Nb3#