1. Qd2!
If 1... Kh4 then 2. Qg5#
If 1... Kg4 then 2. Qf4#
If 1... Kf3 then 2. Qf4# or 2. Qg2#
If 1... Bg4 then 2. Qf2#
If black moves the bishop anywhere else then 2. Qf4#