I played a brilliant move!!!

Today I played a brilliant move against another chess.com player named gusser42. It was a comeback win (with also a lot of blunders.) I am only an 1100 in rapid chess so most of the moves are not that good.  At the very end of the game, I found a brilliant move and they resigned. Here is the puzzle for the brilliant move.

                                                               

                                                            Here is the answer                                                                                                      

Did you get it? That was a nice move, right. I really loved how the rook was sacrificed for the mate. 

Here are the chess.com statistics for the game.

Sorry for all of the statistics if you thought that they were boring, and here is the entire game.