Mate in 16

In a game of speed chess I defeated my opponent in 16 moves. He was Marquestreefrog of the United States, who played black. Here are the moves of the game:

1. e4 e5
2. f4 d6

Black declines the pawn sacrifice.

3. Nf3 h6

Black wants to prevent Ng5, but a developing move such as Nf6 is better.

4. Bc4 Nc6
5. 0-0 exf

Now black accepts my pawn. This allows me to build a strong pawn centre.

6. d4 g5
7. e5 d5
8. Bb5 Bd7
9. c4 a6

If black takes my pawn, I can advance the d-pawn.

10. Bxc6 Bxc6
11. Nc3 Bb4
12. e6 fxe

There are two reasons behind the pawn sacrifice. I clear e5 for my knight and after moving the knight I can check on h5 with my queen.

13. Ne5 Bxc3

Black makes a mistake. He probably expects the recapture bxc3, but I can deliver a devastating check on h5. Here black needs to play Nf6.

14. Qh5+ Ke7
15. Qf7+ Kd6
16. c6#

My c-pawn delivers mate. The keys to victory in this game are my ability to expose the uncastled king and black's failure to play Nf6. This enables me to mate quickly.