Stonewall
1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 d5 5.Nf3 c6 6.O-O Bd6
ECO A80–A99 · Level: Intermediate · Also known as: Dutch, Stonewall, Leningrad
The Dutch Defence (1.d4 f5) controls e4 with the f-pawn and prepares a kingside attack. It is an unbalanced, fighting defence.
1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O
Associated with the 18th-century Dutch author Elias Stein, it was played occasionally by Alekhine and Botvinnik. The Stonewall and Leningrad are its best-known forms.
1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 d5 5.Nf3 c6 6.O-O Bd6
1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6
1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5
1.d4 f5 2.Bg5 h6 3.Bh4 g5 4.Bg3 f4 5.e3 h5 6.Bd3 Rh6 7.Qxh5+ Rxh5 8.Bg6#
Chasing the bishop with pawns loosens Black's king. After 6...Rh6??, 7.Qxh5+! Rxh5 8.Bg6 is mate because f7 is unguarded.
For Black players who play for a win against 1.d4 and enjoy unbalanced positions.
It is slightly risky because it weakens the kingside, but played well it offers strong counter-chances.