Mate in 13

In a game of speed chess I mated my opponent in 13 moves. My opponent was dusanmarkovic1989 of Serbia, who played black. Here are the moves of the game:

1. e4 e5
2. Nf3 Nc6
3. c3 Nf6

My third move isn't so common. More common moves are Bb5 and Bc4.

4. d4 Nxe4

I expect black to play exd, but he captures a pawn with his knight.

5.Bd3 exd

Black takes another pawn, but this is a mistake. He needs to save his knight with a move such as Nf6.

6. Bxe4 dxc

Black has three more pawns, but this isn't enough compensation for the loss of his knight.

7. Nxc3 Bb4

8. 0-0 0-0

9. Ng5 Be7

Black fails to stop the loss of the h7 pawn. A better move is h6.

10. Nxh7 Kh8

11. Qh5 g6

Black can't save the game.

12. Qh6 Bf6

13, Nf6#

I win with a discovered check.

The key to this game is black's fifth move, exd. He decides to capture a central pawn, but loses his knight and the game. My eleventh move, Qh5, is an aggressive move which quickly ends the game.