what is a brilliant move

Brilliant Moves are always the best or nearly best move in the position, but they 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 additional conditions:
You should not be in a bad position after a Brilliant move
You should not be completely winning even if you hadn't found the move.
We are also more generous in defining a piece sacrifice for newer players compared to those who are higher rated. also, I don't what a brilliant move is sorrrry also I copied and paste this