Stonewall pawn structure

The Stonewall pawn structure usually consists of Black pawns on c6, d5, e6, and f5, or the mirrored White formation on c3, d4, e3, and f4. In a square name such as c6, the letter names a vertical file and the number a horizontal rank. The four pawns create a compact barrier that gains space and controls central squares.

With Black's formation, the pawns strongly control e4 and often support activity on the kingside, the half of the board where the kings begin. However, e5 can become a stable square for a White piece, and Black's light-squared bishop may be blocked by its own pawns. The White formation creates corresponding issues with the square colors reversed.

The structure's character

• It is solid and offers a recognizable plan, meaning connected actions for attack or expansion on one side of the board.
• It is rigid because pawns cannot move backward and several advances weaken the barrier.
• The opponent often fights the formation by exchanging bishops, occupying a weak square, and using pawn breaks, advances or captures intended to open lines, in the center or on a wing.
• The Stonewall player tries to activate the restricted bishop and prepare a break before the weaknesses become permanent.

Stonewall also appears in opening names, including the Stonewall Attack and the Stonewall Dutch. Those names describe development systems, meaning ways of bringing pieces away from their starting squares; this entry describes the pawn formation that may remain afterward. Strategy, the choice of long-term goals, should follow the actual structure, not merely the opening label.