Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Kan_Variation
Moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 g6 6. Be3 Bg7 7. Qd2 b5 8. a3
Bb7 9. f3 Nc6 10. h4 h6 11. O-O-O Rc8 12. f4 Nge7 13. g4 b4 14. axb4 Nxb4 15.
Bg2 Qa5 16. Nb3 Na2+ 17. Nxa2 Qxa2 18. Qxd7+ Kf8 19. Qd8+ Rxd8 *
Position (FEN): 3r1k1r/1b2npb1/p3p1pp/8/4PPPP/1N2B3/qPP3B1/2KR3R w - - 0 20
White to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 717
Best move: Rxd8#