What does this mean? brilliant?!

   why is this brilliant? isnt it obvious? what is a brilliant move? can anyone explain?

@1

Chess.com adopts a loose definition of brilliant.

A true brilliant move satisfies 4 criteria:

1. It is a winning move: drawing or losing moves are not brilliant.
2. It is unique: when 2 moves win, then none is brilliant.
3. It involves a sacrifice, as that is aesthetically pleasing.
4. It is a quiet move, no check (+) or capture (x), as those are too obvious to be considered brilliant.

An example of a true brilliant move: 30 Ba3
https://www.chessgames.com/perl/chessgame?gid=1031957

thank you, I was wondering cuz my bishop move felt too obvious to me... so I wanted to know if too obvious moves can also be classified under brilliant moves

No, don't thank him. Everything tygxc wrote is complete nonsense and has nothing to do with how chess.com uses the word.

On chess.com a brilliant move is "a sacrifice that's good". It may be obvious (like here). It isn't necessarily the best move.

A brilliant move is when you find a great sacrifice . In this situation if the king takes the bishop then you can take its queen from your queen

From my experience, brilliant moves in chess.com tend to fall into one of two veins:

1. A move that uses a sacrifice to gain an advantage, while also being one of the best moves available

2. A move that is one of the best moves available, and one that is not intuitive or obvious in why it's so successful. Such moves often seem to expose your own pieces to danger in the process

Note that a brilliant move need not be a sacrifice. Here's a non-sacrifice example that happened in one of my bot games:

The brilliancy occurs on move 17 with Bxd3. Black is free to capture this d3 pawn, despite looking like it gets the Black Bishop set up to be taken. The bot failed to understand why this Bishop cannot be captured: if the e-pawn captures that Black Bishop (or the Knight), it stops blocking the e-file, and a swift checkmate follows.