1. Qf1 is the only move so that the Queen can go to white squares on b1, d3, and f5. This move threatens Qb1 so that you can attack the bishop and the h7 pawn at the same time. If 1. ... Bb2 then 2. Qb1 or 1. ... Bc3 then 2. Qd3 or 1. ... Bd4 then 2. Qd3 or 1.... Be5 2. Qf5 etc... followed by mate by capturing the bishop or the h7 pawn.
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