Tried to castle with my queen

Why is this Brilliant?

White to play, mate in 3

I can’t believe my opponent missed this obvious move

Mate in 3 white to move

white to move and win a pawn, I guess

pretty much prove the +2.54 advantage

Why is Nb3 better then trapping the queen ?

I did go into analysis and did click show moves. With Nb3 you simply win the bishop after Qg3, but Nde4 still wins the full queen for bishop (Qxc1 is the best move for black) and a knight. This is the full game https://www.chess.com/live/game/87160226079

LFG

Finally broke 1000! Now I can sleep

Knight takes on E6 is brilliant move. Can you see why?

I figured after Rxg2 I could take back with the King because of the pin. I guess not?

Can you find the early game mate in 2 I missed?