Chess Board
[ECO code C23]
(CLASSICAL) BISHOP'S OPG. - Philidor Var.
Lewis Counter-Gambit
White's Queen on KB3(f3) captures Black's queen on KB6(f6), starting an exchange of queens.
Black's King's Knight's Pawn removes White's queen for equality in the coming middlegame.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	P-Q4   PxP
 2. B-B4   B-B4	     7.	B-Kt5  PxP
 3. P-QB3  P-Q4	     8.	BxKt   P-B7
 4. BxP	   Kt-KB3    9.	Kt-B3  QxB3B
 5. Q-B3   0-0	    10.	QxQ    PxQ
Example ends: Undo or Jump or Clear