Just beat my first 2000 ELO bot at 900 ELO feelin good

Feels lame but here's my first brilliant move

[WHITE TO MOVE] Mate in 3

There was an attempt to protect the rook

First brilliant move!

(very very new to chess) how is this considered a tie and not a win? no matter how he will move i will take the king

Nice checkmate I found today, black blundered with this pawn.

Milestone reached — after three months of learning chess I'm back to 800 on Chess.com! Still a long way to 1500 on Lichess though...

Stopped playing live games and focused on puzzles and studying. Playing games again, but I’m underrated now. 🤔

Black To Play, Brilliant Mate in 3

Why is this brilliant?