Blockade

The most common blockade is created by placing a piece on the square immediately in front of an enemy pawn. Because a pawn does not capture forward, it cannot advance while that square remains occupied. This matters especially against a passed pawn, meaning one with no enemy pawns ahead on its file or neighboring files, and against an isolated pawn, which cannot be supported by another pawn.

A knight is often a good blockader because it can sit in front of the pawn while still attacking nearby squares. In an endgame, the phase in which relatively few pieces usually remain, the king can perform the same job. A bishop, rook, or queen can also blockade, but tying a long-range or highly valuable piece to that task may be inefficient.

What makes a blockade secure

• The blockading piece is defended and cannot be chased away easily.
• Other pieces can attack the stopped pawn without allowing it to advance again.
• The blockade creates lasting restraint, forcing enemy pieces to lose space or work to free the pawn.

A blockade does not win the pawn by itself. The opponent may exchange the blockader, attack its defenders, or prepare a pawn break, which is a pawn move intended to open the position. The idea is strongest when it supports a wider plan of restriction and attack rather than leaving one unsupported piece parked in front of the pawn.