13 Moves to Mate

If it is Black to move, why not Qxg2#? I don't see any piece that can capture the Black Queen, (the White King can not capture the Black Queen because of the Black Bishop on b7, even though it is pinned, the WK can not move into check); there is no way to interpose a piece between the WK and BQ, and the WK can not move out of check to a safe square.

Sorry, you guys are correct, I made an error in my diagram. I have adjusted it and I hope it is correct now. This puzzle was inspired by an actually game although the last move my opponent (playing Black) made was actually Qf7 to protect the g7 pawn...but the ending should have been similar except I messed up.