To be fair, both players probably stumbled into this "brilliancy" by accident. The idea is really tactical and worth seeing though, so this is a cool forum thread you created. Thanks for showing it to me
7. fxe4?? is a blunder because White misses the opportunity to play 7. Qxb7 and trapping the Rook in the corner! If 7. Qxb7 Qc6?? is the only logical way to "save" the Rook on h8, but then comes 8. Bb5! and White is crushing Black as the Queen is now pinned.
This is a key to understanding the "Brilliant" move soon played. Point being that the normal-looking 7. fxe4?? overlooks the chance to trap the Rook on h8. So...
7...Nxe4!! is considered "Brilliant" because now it lets White capture on b7. The tactical compensation will justify sacrificing the b7 pawn and h8 Rook!
8. Qxb7 Nxc3! (only move Black has to keep the advantage) 9. Qxa8? Qd1+ 10. Kf2 Ne4+! (Again, only move that keeps Black winning!) and Black is much better despite the sacrificed material.
Edit: btw 9. bxc3 instead is met with 9...Qe6+! (only move once again) and Black is still winning! It is more natural to examine the "mainline" of what happens if White takes the a8 Rook though.
I am a bit of a beginner, around 1000 rated, and I recently played a game in which it says I played a brilliant move (after a few blunders, naturally). I was wondering if anyone could give me an explanation for it? Its my first brilliant move so I'd like to understand it properly. Thanks in advance, this is a link to the game report:
https://www.chess.com/analysis/game/live/10183874809?tab=report