Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Nxd5 4. e4 Nf6 5. Nc3 e5 6. dxe5 Qxd1+ 7. Kxd1 Ng4
8. Be3 Nxe5 9. h3 Be6 10. f4 Nc4 11. Bxc4 Bxc4 12. Nf3 Nc6 13. a3 O-O-O+ 14.
Kc2 Bd3+ 15. Kb3 Na5+ 16. Ka2 Bc4+ 17. Kb1 Nb3 18. Ra2 *
Position (FEN): 2kr1b1r/ppp2ppp/8/8/2b1PP2/PnN1BN1P/RP4P1/1K5R b - - 10 18
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1706
Best move: Bd3#