A rook endgame is a phase of the game where both sides have only rooks remaining (with or without pawns), all other pieces having been exchanged. It is the most common endgame type in practice, as rooks tend to be the last pieces on the board.
What makes rook endgames distinctive is the combination of highly active pieces and an increasingly important king. Unlike minor piece endgames, rooks control entire ranks and files, making their placement critical. The key principle is rook activity: a rook should be placed behind a passed pawn — whether your own or your opponent’s — or on an open file to maximize its influence.
In practice, two theoretical positions are essential knowledge: the Lucena position (a winning technique to promote a passed pawn) and the Philidor position (a defensive drawing technique). Recognizing these structures during a game allows a player to make confident, purposeful decisions in what can otherwise feel like a chaotic phase.