Chess puzzle (Checkmate)
Opening: Alekhine_Defense, Alekhine_Defense_Four_Pawns_Attack
Moves: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Nf3 Bg4 8. Be3
e6 9. a3 Be7 10. Nc3 O-O 11. Be2 f6 12. exf6 Bxf6 13. O-O Bxf3 14. Rxf3 Nxd4
15. Bxd4 Qxd4+ 16. Kh1 Rad8 17. Qf1 Be5 18. Rd1 Qh4 19. g3 Rxd1 *
Position (FEN): 5rk1/ppp3pp/1n2p3/4b3/2P4q/P1N2RP1/1P2B2P/3r1Q1K w - - 0 20
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 906
Best move: Rxf8#