So I am guessing that by Cxe5, you are referring to the knight taking on e5 (since C would be Cavalier or knight in French), which leaves your bishop on e4 hanging to the f pawn. That is your sacrifice. If you run the position through the engine analyzer, your move would not be the best move but it is close to it.
/ Brilliant moves are just decent sacrifices. (See https://support.chess.com/article/2965-how-are-moves-classified-what-is-a-blunder-or-brilliant-and-etc )
Brilliant (!!) moves and Great Moves are always the best or nearly best move in the position, but are also special in some way. We replaced the old Brilliant algorithm with a simpler definition: a Brilliant move is when you find a good piece sacrifice. There are some other conditions, like you should not be in a bad position after a Brilliant move and you should not be completely winning even if you had not found the move. Also, we are more generous in defining a piece sacrifice for newer players, compared with those who are higher rated.
Hello,
I need your help. Indeed, in the game of which I put the capture below, I played Cxe5, move that the analyzer notes me as "brilliant". I can't understand why. Can you help me?