I don't understand - Why is this brilliant?

Hello everyone,

Today I analyzed the game I lost and found that my opponent had done a brilliant move. But it was just an ordinary pawn capture with a rook. Anybody knows why?

Thanks,

@MitulKH

I just used a lichess analytical board and if you play the best moves from here as white and black, it leads to white having a rook and king vs blacks king. Keep in mind that I only used depth 13

where is the full game

The moves chess.com's analysis shows as 'brilliant' are moves which the engine at first instance thought were not the best move, but later turned out they were. Frankly it doesn't really say anything about the move being brilliant or not. A lot of brilliant moves are very hard to find for human players but the engine sees them as the obvious only winning/drawing move. Engines don't think like humans, and although great and bad moves are cleanly separated by the engine, brilliancies and ordinary top moves aren't.

It also allows Be5 and it's nearly laddermate. Because your opponent moved the rook up the bishop checking the king will not block the e file for the rook.

Black king might respond to king f7, attacking the knight. But then, you can capture pawn on c7, attacking the queen and making a discoverd check.