Chess.com has had computer programs set up to evaluate moves for years. The original definition for "brilliant" moves was never posted but the concept required the position evaluation score to increase after a certain search depth had been reached. This resulted in sometimes very obscure moves being declared "brilliant".
After receiving many complaints, a new set of rules was adopted for "brilliant" moves" in 2021.
- Must include piece sacrifice
- Best or near best move
- Should not result in a bad position
- Position should not be completely winning without the move
- Adjusted for rating
They just do what they are told.
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.
It's flattering and all but is this really a brilliant move?