Please help, I don't understand this.
How is this a brilliant?
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Wow
Black can try to save the knight (with Nc2), but the knight is trapped anyway, so it isn't any better.
When black leaves the knight to be captured, and plays a random legal move, the dumb chess.com script sees it as a "piece sacrifice" which is good (as there is nothing better, the knight is lost anyway). So it awards the "brilliant" title. Which doesn't make any sense.