Can anyone explain why this is brilliant/a winning move?

I knew this was the right move in the moment, but when I look at what the next moves should look like, it’s just exd4 which is what black plays. I ended up winning this game but I feel like there’s an easy checkmate early on here. Could anyone shed some light on this for me?

image
Read also:

Brilliant Move?

Why was this love from my opponent considered brilliant? He blunders his Queen.

image

Probably one of my best games. Against a opponent that is stronger than me and I was losing.

image

Mate in 1, I found today

I'm only 500 ELO, so pretty pleased that I saw this one

image

White to Play, Mate in 2

image

Oh no

image

They fell for it. They said “Wow” and resigned immediately after

image

My weirdest looking checkmate yet

image

Why would Black play this?

I was playing computer and it played this move and I mated in 2. But for life of me I can't figure out why it would move the defender. Is there actually any tactic I am missing?

image

might not be very impressive, but I found my first forced mate in more than two moves

image

might not be very impressive, but I found my first forced mate in more than two moves

image