Winning Tactic

In a game of speed chess versus Mikehw of England, I used a winning tactic to force a quick resignation. My opponent played black. Here are the moves of the game along with my commentary:

1. e4 e5
2. Nf3 d6

Black chooses a passive defence. Nc6 is more common.

3. d4 exd

I immediately challenge black's centre.

4. Nxd4 Be7
5. Nc3 Bf6

Black moves the bishop again. It is better to develop the knight.

6. Be3 Ne7
7. Qd2 Ng6

Black moves the knight again. It is better to castle or develop another piece.

8. 0-0-0 a6
9. Kb1 b5
10. Nce2 c5

Black advances the queenside pawns, but the black king remains exposed in the centre of the board.

11. Nf5 Qc7
12. Qxd6 Be5

I win a pawn, but to my surprise, black does not recapture. I expect ...Qxd6 13. Nxd6+. Blacks wants to avoid this, but his move is a blunder.

13. Nxg7+

I sacrifice my knight to win black's queen. Black must reply Bxg7 and then I play Qxc7. My thirteenth move is so strong that black decides to resign.

I win quickly because black falls behind in development, leaves his king exposed in the centre and blunders on his twelfth move. He loses a valuable pawn and then overlooks my knight sacrifice, which ends the game. My knight sacrifice is undoubtedly a surprise.