Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Albin_Countergambit
Moves: 1. d4 d5 2. c4 e5 3. e3 exd4 4. Qxd4 Nf6 5. cxd5 Qxd5 6. Qxd5 Nxd5 7. Nf3 Nc6
8. Bb5 Bd7 9. O-O O-O-O 10. a3 Na5 11. Bxd7+ Rxd7 12. Rd1 Nb3 13. Ra2 Nxc1 14.
Rxc1 Nb6 15. Ne5 Re7 16. Nc4 Nxc4 17. Rxc4 Rd7 18. b4 *
Position (FEN): 2k2b1r/pppr1ppp/8/8/1PR5/P3P3/R4PPP/1N4K1 b - - 0 18
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 994
Best move: Rd1#