Stonewall Attack

The Stonewall Attack is a chess opening characterized by White (generally) playing their pawns to d4 and e3, playing Bd3, Nd2, and then playing pawns to c3 and then f4; although the moves are not always played in that order (see transposition). The Stonewall is a "system"; White heads for a very specific pawn formation, rather than trying to memorize long lines of different variations. If White puts up the Stonewall formation it is called the "Stonewall Attack", regardless of how Black chooses to defend against it. When Black sets up a Stonewall formation, with pawns on c6, d5, e6 and f5, then it is a variation of the Dutch Defense. "MCO-15" gives the following as a main line: 1.d4 d5 2.e3 Nf6 3.Bd3 c5 4.c3 Nc6 5.f4. 
"ECO".
Since the Stonewall system is used against a variety of Black defenses, the "Encyclopaedia of Chess Openings" ("ECO") has trouble classifying it. Among the codes used are D00 (when Black has played ...d5), A45, and A03 (the code for Bird's Opening).
Example game.
This sample game illustrates what can happen if Black defends poorly.
References.
Bibliography