Chess Board
[ECO code D02] Move Move Here
QUEEN'S PAWN GAME
(to) Colle System
Black's QBP set on QB3(c6) freed the Q-side for his queen, likely seeking a form of QGD, Slav Defence.
White's King's Pawn push is not as harmless as it looks - it triples his QP support and frees his KB (described by Harry Golombek as "by far the most dangerous minor piece in the Colle Sys."). W-Alt. 
	White   Black
 1.	P-Q4    P-Q4
 2.	Kt-KB3  P-QB3
 3.	P-K3
BLACK to Move or Undo or Jump or Clear
 
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