Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Bxc6 dxc6 5. d3 Bg4 6. h3 Bh5 7. g4 Bg6 8.
Nxe5 Bc5 9. Nxg6 fxg6 10. a3 O-O 11. Qe2 Qe7 12. Be3 Bd6 13. Nd2 Rae8 14. O-O-O
a5 15. Nc4 b6 16. f4 b5 17. Nxa5 Bxa3 18. Nb3 Bb4 19. e5 Nd5 20. Rhf1 Ra8 21.
c3 Bxc3 22. Bc5 Ra1+ 23. Nxa1 Qxc5 24. bxc3 Qxc3+ 25. Nc2 Ra8 26. Kb1 Nb4 27.
Nxb4 *
Position (FEN): r5k1/2p3pp/2p3p1/1p2P3/1N3PP1/2qP3P/4Q3/1K1R1R2 b - - 0 27
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1506
Best move: Ra1#