Puzzel 11

Find the brillant move and explain my is brillant! 

bishop to g6? because then if black takes queen g6 mate

Yes but black play bishop take d2! And I make a big mistake there, i take the bishop with my king just becuse I dont want to lose my batteri with the Queen and my White bishop! So the best is to take with the Queen so he dont can play Queen G5! And just go in with the Queen and attack but stil I win in the endgame but it was a thuff match