Chess Board
[ECO code C23] Move Move Here
(CLASSICAL) BISHOP'S OPG. - Philidor Var.
Side Variation
White's incorrect QP advance to Q4(d4) freed his QB and attacked Black's bishop, but risked a pawn.
Black's KPawn on K4(e5) removes White's QP and invites an exchange while enabling his queen to attack White's undefended KP.
	White	Black
 1.	P-K4	P-K4
 2.	B-B4	B-B4
 3.	P-QB3	Q-K2!?
 4.	P-Q4?!  PxP
WHITE to Move or Undo or Jump or Clear
 
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