Chess puzzle (Checkmate)
Opening: Grunfeld_Defense, Grunfeld_Defense_Exchange_Variation
Moves: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. Nc3 d5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 c5 8.
Be3 Qa5 9. Qd2 O-O 10. Rc1 cxd4 11. cxd4 Qxd2+ 12. Nxd2 Nc6 13. Nb3 Rd8 14. d5
Nb4 15. a3 Na2 16. Rc7 e6 17. Bc4 Nc3 18. dxe6 *
Position (FEN): r1br2k1/ppR2pbp/4P1p1/8/2B1P3/PNn1B3/5PPP/4K2R b K - 0 18
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 420
Best move: Rd1#