A Queen's Pawn Side Defence appealing to the more
attacking player as it gives Black a measure of counterplay (although
less suitable for beginners). First noted in "Traite des Amateurs" in
Black replies 1..P-KB4 to White's P-Q4
(move 1wb, seen left) in an outright attempt
to obtain control of White's K4 (and permanently prevent the
advance of White's KP). Using this square as a
springboard for his Kt or Kts, Black aims at an attack
on the K-side.
The drawback of this defence is that Black's pawn structure tends to
become unsound and several of his pawns get placed on White squares
(eg. Stonewall move 7wb, right) giving
difficulty in developing his QB. However White has little option
but to follow the early opening into one of three branches (the
Stonewall, the Classical and the Leningrad) or
play the Staunton Gambit.