Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 Nf6 5. Bg5 Be7 6. Qe2 O-O 7. O-O-O Nc6 8.
Qb5 a6 9. Qb3 Na5 10. Qa4 Bd7 11. Bxf6 Bxa4 12. Bxe7 Qxe7 13. Nxa4 b5 14. Nc5
Nc6 15. Nf3 Nxd4 16. Nxd4 Qxc5 17. g3 Qb6 18. Bg2 Rad8 19. Nb3 Qxf2 20. Bxd5 c6
21. Bxc6 Rxd1+ 22. Kxd1 Rc8 23. Be4 Rd8+ 24. Kc1 Qe3+ 25. Nd2 Qxd2+ 26. Kb1
Qd1+ 27. Rxd1 *
Position (FEN): 3r2k1/5ppp/p7/1p6/4B3/6P1/PPP4P/1K1R4 b - - 0 27
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 399
Best move: Rxd1#