Black has an extra Bishop. It can make a big difference by coordinating with the King, and helping the Black pawns to promote. So White must act fast.1.f4...The goal is simple - to get rid of all of Black's pawns so none of them can queen.1....Bf61...gxf42.exf4(2.gxf4is a mistake becauseBd63.Kf3Kd5wins for Black. White can't trade the f5-pawn, which will go on to become a Queen.)Bd63.Kf3Kf64.g4fxg4+5.Kxg4is a draw.1...Bd62.fxg5White will be able to get rid of Black's f5-pawn.2.fxg5Bxg53.Kf3Ke54.g4...Mission accomplished.4....fxg4+5.Kxg4Bxe3