Connected pawns

Connected pawns are two or more same-colored pawns whose files form one continuous group. A file is a vertical line and a rank is a horizontal line of the board. They may stand on the same rank or on different ranks; the essential feature is that no empty file splits the group between its first and last pawn.

Connection makes cooperation possible, but it does not guarantee that the pawns currently defend each other. Two level pawns form a pawn duo and do not yet protect one another. Pawns staggered diagonally so that the rear pawn protects the forward one form a pawn chain.

Connected pawns are often flexible because they can advance in coordination and create mutual support. They can still be weak if a piece stops them from in front, if they advance so far that they lose support, or if several pieces attack them. The placement of the kings and pieces determines whether the connection is genuinely useful.

A particularly strong case

Two connected passed pawns, meaning neighboring pawns that individually have no enemy pawns ahead on their own or adjacent files, can support each other as they advance. They often force the opponent to dedicate a piece or king to blockading them, although they are not invincible and concrete captures must still be calculated.