Chess puzzle (Checkmate)
Moves: 1. d4 e6 2. Nf3 b6 3. Bf4 Bb7 4. e3 f5 5. c3 Nf6 6. Nbd2 Bd6 7. Be5 O-O 8. Bxd6
cxd6 9. Bd3 d5 10. Qc2 Nc6 11. O-O Rc8 12. Qd1 Ne4 13. Bxe4 fxe4 14. Ne1 Ba6
15. c4 Ne7 16. Nc2 Bxc4 17. Nxc4 Rxc4 18. b3 Rc3 19. Qd2 Qc7 20. Rac1 Rc8 21.
Na3 Rxc1 22. Rxc1 Qxc1+ 23. Qxc1 *
Position (FEN): 2r3k1/p2pn1pp/1p2p3/3p4/3Pp3/NP2P3/P4PPP/2Q3K1 b - - 0 23
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 400
Best move: Rxc1#