Chess puzzle (Checkmate)
Opening: Four_Knights_Game, Four_Knights_Game_Other_variations
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d3 Bc5 5. h3 d6 6. Bg5 h6 7. Bh4 g5 8. Bg3
Be6 9. Be2 Qd7 10. O-O O-O-O 11. Nd2 h5 12. Nb3 Bb6 13. d4 exd4 14. Nb5 Nxe4
15. N3xd4 Nxg3 16. fxg3 a6 17. a4 axb5 18. axb5 Nxd4 *
Position (FEN): 2kr3r/1ppq1p2/1b1pb3/1P4pp/3n4/6PP/1PP1B1P1/R2Q1RK1 w - - 0 19
White to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 1187
Best move: Ra8#