Chess Board
[ECO code C23] Move Move Here
(CLASSICAL) BISHOP'S OPG. - Philidor Var.
Side Variation
Black developed an early queen to K2(e7) to defend his KP against 4.P-Q4, hoping for an error in reply.
White incorrectly advances his Queen's Pawn to the centre, freeing his QB and attacking Black's dark bishop but risking the loss of a pawn. W-Alt. 
	White	Black
 1.	P-K4	P-K4
 2.	B-B4	B-B4
 3.	P-QB3	Q-K2!?
 4.	P-Q4?!
BLACK to Move or Undo or Jump or Clear
 
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