Use your rook to block checks and help the pawn promote.
In the Lucena winning method, your king is in front of an advanced pawn and needs to escape checks. Prepare the rook so it can block a check after the king moves out. The exact rook square depends on the king, pawn and opposing rook.
Use the open file with your rook
No pawns block this file. Your rook can use it to enter the opponent’s position.
2 more clean runs (at any point) to reach Recall.