Chess Board
[ECO code C23] Move Move Here
(CLASSICAL) BISHOP'S OPG. - Philidor Var.
(to) Petroff Gambit
Black developed his queen early to K2(e7) to support his KP against 4.P-Q4 - an alternative route hoping a White mistake would gain him a pawn.
White rightly develops King's Knight to KB3(f3), supports 5.P-Q4 and enables castling. W-Alt. 
	White	Black
 1.	P-K4	P-K4
 2.	B-B4	B-B4
 3.	P-QB3	Q-K2!?
 4.	Kt-KB3
BLACK to Move or Undo or Jump or Clear
 
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