Chess puzzle (Checkmate)
Opening: Russian_Game, Russian_Game_Three_Knights_Game
Moves: 1. Nc3 Nf6 2. e4 e5 3. Nf3 d6 4. d4 exd4 5. Qxd4 Nc6 6. Bb5 Bd7 7. Bxc6 Bxc6 8.
Bg5 Be7 9. O-O-O Nd7 10. Bxe7 Qxe7 11. Rhe1 O-O-O 12. Nd5 Bxd5 13. exd5 Qf6 14.
Qxa7 Qf4+ 15. Kb1 Rhe8 16. Nd4 Rxe1 17. Rxe1 Qxf2 18. Nc6 *
Position (FEN): 2kr4/Qppn1ppp/2Np4/3P4/8/8/PPP2qPP/1K2R3 b - - 1 18
Black to move.
Themes: Hanging Piece Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 811
Best move: Qxe1#