I think the way it works is that it has to be a critical move (the only good move in the position) and it has to be winning on the spot. You should check with the variation it gives you to see why it is a brilliant move
Im not too good at chess, but can someone explain what makes my move here brilliant?
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I played against my friend (who didnt exactly make the best moves, and nor did i). But one of my moves got this brilliant from the engine. Is it really that good, cause it looked like an obvious move to me. https://www.chess.com/analysis/game/live/14055666237?tab=analysis