This is kind of a fun one. The way it played out, mate is forced on move 19. Black's 18th move was a bit of a blunder, but there was an unstoppable mating attack on anyway. See if you can spot it (it's fairly easy as all the moves are forced).
1. e4 c5 2. Ng1f3 Nb8c6 3. d4 e6 4. c4 d5 5. cxd5 exd5 6. Nb1c3 dxe4 7. Nc3xe4 cxd4 8. Bf1c4 h6 9. O-O f5 10. Ne4d2 Bc8d7 11. Nd2b3 Qd8f6 12. Rf1e1 Bf8e7 13. Nb3xd4 O-O-O 14. Bc1d2 Nc6xd4 15. Bd2c3 Nd4xf3 16. Qd1xf3 Qf6f8 {There is now an unstoppable (I'm fairly certain) mating attack for white. See if you can spot it.} 17. Bc4a6 Bd7c6 {The only other possible defenses for black (that I can see) are bxa6 or Re1 (clearing a flight square for the king). Neither of these prevent mate (although bxa6 would prevent this game from appearing in this thread).} 18. Qf3xc6 1-0
Originally posted by PhySiQ Mate in 17 with one exchange. A bullet game (1 min. No incr.)
[pgn][Event "Live Chess"]
[Site "Chess.com"]
[Date "2011.11.15"]
[Result "1-0"]
[TimeControl "1|0"]
[Termination "won by checkmate"]