Chess puzzle (Checkmate)
Moves: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qe6+ 4. Be2 a6 5. d4 b5 6. d5 Qg6 7. Bf3 Bb7 8.
Nge2 Nd7 9. Nf4 Qd6 10. Ne4 Qb4+ 11. c3 Qa5 12. O-O Ngf6 13. Nxf6+ Nxf6 14. Re1
O-O-O 15. b4 Qb6 16. Be3 Qd6 17. Qb3 Bxd5 18. Bxd5 Nxd5 19. Nxd5 Qxd5 20. c4
Qxc4 21. Qa3 Qc6 22. Rac1 Qb7 23. Rxc7+ Kxc7 24. Rc1+ Kb8 25. Qb2 Qc6 26. Rxc6
*
Position (FEN): 1k1r1b1r/4pppp/p1R5/1p6/1P6/4B3/PQ3PPP/6K1 b - - 0 26
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 400
Best move: Rd1#