The technique is to build a 'bridge' for the King with your Rook so that the passed pawn can be promoted.
Try it yourself on Chessvideos
Details with different variations on Wiki Explanation from IM Jeremy Silman
Analysis on YouTube
This is the famous game played between Anderssen and Dufresne.
When Lars Grahn asked Judit Polgar eleven years ago, as she was about to get married to her boyfriend Gustav, if she thought it was possible to combine family life with a chess career at top level, and she told him she would let me know when she had some experience of it. Eleven years and two children later Judit replied provided the answer in an in-depth interview in CHESS Magazine.