Your the man was about to post the Lucena position! You saved me time! Thanks.
The Lucena key Characteristics are the King is on the 8th rank in front of his own pawn and the king can not be bothered by meanigful checks; And the opposing King is cut of from the pawn by 1 file.
I got the idea to post this after I saw Njall's rook-endings studies.
White to move and win.