This is not my only brilliant move. I had one game with tonnes of blunders and missed wins and then I played a move which I did not understand and that is Nd5. Here is a preview
Keep it in mind that I was black
I'm pretty sure it's brilliant because it allows your bishop to be taken, as well as adding pressure to a pinned piece. If white takes, you can take back with the queen with check. The king only has one move available, and then you can actually castle queenside to force either mate in 6 or winning the knight. Here is the line:
You sacrafice THE ROOK