Defeating Ghosted Bot

Last night I played a chess game with an AI called Ghosted Bot. The game was off to a good start because I kept making it difficult for my opponent's queen to get any one of my chess pieces accept for my queen which I sacrificed and then used my bishop to take it's queen.

The game continued till I promoted my pawn for a queen, and then once I moved my bishop out of the way of the king it was a discovered checkmate and I won!