Chess puzzle (Checkmate)
Opening: Elephant_Gambit, Elephant_Gambit_Paulsen_Countergambit
Moves: 1. e4 e5 2. Nf3 d5 3. exd5 e4 4. Ng1 Qxd5 5. Qe2 Nf6 6. Nc3 Qf5 7. d3 Bb4 8.
Bd2 O-O 9. O-O-O Re8 10. dxe4 Nxe4 11. Nxe4 Bxd2+ 12. Rxd2 Rxe4 13. Qf3 Re1+
14. Rd1 Qg5+ 15. Kb1 Bg4 16. Rxe1 Bxf3 *
Position (FEN): rn4k1/ppp2ppp/8/6q1/8/5b2/PPP2PPP/1K2RBNR w - - 0 17
White to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 476
Best move: Re8#