The general idea is to promote the pawn, but pushing directly will allow Black's King to step in front of it.1.Re1...1.Kh4Ke62.g52.Rf1!! was still cutting-off the King and winning. The pawn push draws immediately as the Black King is able to rush to the defense.Kf73.Kh5Kg84.Kh6Rb8Transposes to the drawish position, with which you are already familiar.1....Rb52.Kh4Rb23.Kh5Rh2+4.Kg6Rg25.g5...The Black Rook alone can't stop White's King and pawn advancement.5....Rh26.Kf6Rf2+7.Kg7Rg28.g6Rf29.Kh7Rh2+10.Kg8Rg211.g7Rh2Now if White King tries to step out, they will recieve lot of checks.12.Rf1...Could be a logical move, trying to play Kf7, however Black also can defend the squares with their King.12.Kf7Rf2+13.Kg6Rg2+12....Ke8If you remember, we have seen this kind of position previously as well, and we will learn the winning technique in the next example.