The main Objective of any operation in an open file is the eventual Occupation of the seventh or eighth Rank.
Aron NimzowitschIt is a well known phenomenon that the same amateur who can conduct the middle game quite creditably, is usually perfectly helpless in the end game. One of the principal requisites of good chess is the ability to treat both the middle and end game equally well.
Aron NimzowitschIn the middlegame, the king is merely an extra, but in the endgame, he is one of the star actors.
Aron Nimzowitsch