Rook vs Knight: The Stranded Horse

Rook versus knight with no pawns is one of the most misplayed endings in chess, in both directions. The defender resigns positions that are dead draws, and the attacker lets won positions slip back to the fortress. The whole evaluation is one word: TOGETHERNESS.

The draw and its exception. Knight beside its king is a fortress; the rook can circle for a hundred moves and never find a way to load a real threat. But a knight separated from its king is a different animal. It moves slowly, it cannot lose a tempo, and every hop is short: a rook plus an approaching king can fence it into a shrinking pen.

The hunting method. King walks toward the knight while the rook cuts the board from a distance, taking away whole ranks of escape squares per move. Avoid the two classic accidents: never step into a knight-check fork of king and rook, and never chase with the rook alone, which just teaches the knight the way home. The knight's trajectory always bends toward the edge, and at the edge its move count collapses.

The practical payoff runs in both directions: as the defender in a rook-down ending you now know the one commandment, keep the knight at home; as the attacker you know exactly when to play on. This drill is the attacking half, against a knight that defends with tablebase precision.