Chess puzzle (Checkmate)
Opening: Rat_Defense, Rat_Defense_English_Rat
Moves: 1. d4 d6 2. c4 e5 3. dxe5 dxe5 4. Qxd8+ Kxd8 5. Nc3 c6 6. b3 Be6 7. Bb2 Kc7 8.
O-O-O Nd7 9. e3 f6 10. h4 Nh6 11. Be2 Rd8 12. Nf3 Ng4 13. Rdf1 Nc5 14. Kc2 Bf5+
15. Kc1 Bd3 16. Ne1 Bxe2 17. Nxe2 Ne4 18. f3 Nxe3 19. fxe4 *
Position (FEN): 3r1b1r/ppk3pp/2p2p2/4p3/2P1P2P/1P2n3/PB2N1P1/2K1NR1R b - - 0 19
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 777
Best move: Rd1#