Passed pawn

A passed pawn has no enemy pawn ahead of it or on either of the adjacent files. Nothing on the board can stop it from advancing toward the eighth rank except pieces — which can be exchanged or driven off. The passed pawn is the most valuable structural feature in the endgame, and in middlegames the threat of one is sometimes enough to decide the position.

Passed pawns are often valued by their protectedness and their distance from promotion. A protected passed pawn — supported by a friendly pawn — is nearly always strong, because it cannot be lost simply by attacking it. A passed pawn on the seventh rank is so strong that giving up a rook to stop it is sometimes the only practical defence.

The classical advice — passed pawns must be pushed — captures one side of the truth. A passed pawn that does not advance is a static asset; the opponent can blockade and ignore it. A passed pawn that is pushed forces the opponent to respond, ties down enemy pieces, and gradually drains the opponent’s resources. The other side of the truth is that pushing too early can lose the pawn; the timing matters as much as the principle.

The blockade is the classical defence against a passed pawn. A knight planted directly in front of the pawn, supported by other pieces, neutralises the threat completely. The blockaded passed pawn becomes a target rather than a weapon, and many endgames are decided by whether the side with the passed pawn can break the blockade.