Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...f5

1. d4 d5 2. c4 e6 2.Nc3 f5

The Dutch Stonewall, contrived through a transpositional trick! This variation avoids the 2. Nc3 and 3. Bg5 lines against the Dutch. Black wants to play f5 only after White plays c4 and Nc3 to have an iron grip on e4.

The downside of playing Dutch Stonewall is that there will be a hole on e5, but White can play f3 to guard e4 while black does not have similar option to protect e5. White will try to blast open the position by arranging to play e4 or g4 (to open up the g file and try to weaken the structure of black) at an appropriate time. Black will try to build up against White's King with a kingside pawn roller. Qh5, Rf6, g5 etc. on White's King is always on cards. White also has play on the queenside.

Weakness pieces of Black

Bishop on c8 - This piece is stuck behind the pawns, but modern day analysis show that it can be maneuvered via d7,e8 and to h5/g6,

Pawn on e6 - It is a backward pawn that is hard to remove.

{ChessTable}

1. d4 d5 2. c4 e6 3.Nc3 f5

Wikipedia has related information at Dutch Defence.