Chess Board
"Stonewall" is the term for a type of Queen's Pawn opening pawn structure on the Q/K/KB files of either or both players. For White the pawns occupy the 3 dark squares Q4+K3+KB4 (d4,e3,f4), and for Black they occupy the 3 light Q4+K3+KB4 (d5,e6,f5).

Typically Black sets up the formation to obstruct attacks, as in the Dutch or in the Semi-Slav defences, while White may adopt it to secure the centre before attacking on the king's-side as in a Queen's Pawn Game variation.

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