Chess puzzle (Checkmate)
Moves: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Qd3 Nxe4 6. Qxe4 Nd7 7. Bc4 Nf6 8.
Qd3 Bg4 9. Qb3 e6 10. Qxb7 Be7 11. Qxc6+ Nd7 12. Bf4 Rc8 13. Qa4 O-O 14. Bd3
Qb6 15. Qxd7 Qxb2 16. Rc1 Bb4+ 17. Kf1 Rfd8 18. Qxa7 Rxd4 19. Be3 Rxd3 20. h3
Qxc1+ 21. Bxc1 *
Position (FEN): 2r3k1/Q4ppp/4p3/8/1b4b1/3r3P/P1P2PP1/2B2KNR b - - 0 21
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 427
Best move: Rd1#