In chess, a brilliant move is a move that is considered the best or nearly best move in the position, but is also special in some way. According to Chess.com, a brilliant move is when a player finds a good piece sacrifice. There are some other conditions, such as not being in a bad position after the move and not being completely winning even if the move had not been found. Chess.com also introduced a new move classification called "Great Move," which is denoted by a single exclamation point (!) . These are moves that were critical to the outcome of the game, such as going from losing to equal, equal to winning, or finding the only good move in a position.
In general, a brilliant move is a move that is exceedingly rare and difficult to find that gives the player more of an advantage in the game. It is also a move that the engine does not think is the best before the move is played at a certain depth, but after it is played and the engine analyzes it, it is proven to be the best move. A brilliant move is also unique, involves a sacrifice, and is a winning move.
In summary, a brilliant move in chess is a move that is considered the best or nearly best move in the position, but is also special in some way, such as involving a good piece sacrifice or being critical to the outcome of the game. It is also a move that is exceedingly rare and difficult to find and gives the player more of an advantage in the game.
