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  3. Checkmate - 14 moves (Zukertort Opening)

I've been trying different openings and I liked this because it's quite aggressive.

11. dxe5 - I wanted to exchange queens but they didn't go for it. Instead moving Ng4... but I initiated the exchange anyway.

13. Rfd1 - again, offering the exchange and it being declined with Nxf2.

14. Rxd8# - the fatal move my opponent failed to spot.

Having checked the analysis I know there were a few weak moves on my part, but overall I would call it a success.

I'm not sure if you chose one of the most aggressive openings for white. It's certainly one of most flexible openings that can be adopted, allowing the player to transpose the game into several other openings, just by swapping around the conventional move order. Here's an example:
1. Nf3 e5 2. e4 Nc6 3. Bb5 (which, as you may already know, is a variation of the Ruy Lopez, also known as Spanish opening).
Maybe it was such a flexibility that fascinated you, as it might be an advantage to keep the opponent unaware of how you are planning to develop your game by playing a first move that doesn't give away your intentions right out of the beginning. As for the game itself, it may be worth noticing that your opponent doesn't appear to have followed the most basic principles of chess openings, just look at what the situation on the board was like after 4. Bxe3. (you had already deployed a bishop, knight and pawn and your opponent had all the pieces still at home).
Fast deployment should be imperative when starting a chess game, so it was not a good idea when your opponent pushed that pawn forward on 2. …. d4, giving up the chance of moving some other piece to either occupy or control the centre at a distance and therefore strengthening their position. After all, it seems that even a 14-move game can deliver plenty of useful information about this amazing game we're so interested in. Thanks for posting this and have a nice day!

there are much more aggresive openings,like the sicilian or the kings gambit.but the zukertort is flexible ,as mentioned be #2