Jack, maybe I'm being a bit dense here, but all I see is 1. Bf1 to stop the g-pawn. Then White pushes his f-pawn, wins it for the Bishop and mops up. Something like 1... Bd7 (threatening 2... Bh3) 2. Ng5, followed by Kg6, f4, f5, etc. Possibly throwing in Bg2 helps as it stops the Black king activating itself by g2, followed by Kg3. Is that the point of the study, something like 1. Bf1 Bd7 2. Ng5 g2 3. Bxg2 Kg3 4. Bf1 Bc6 5. Be2 Kf4 when it is difficult to get the f-pawn going?