Chess Board
[ECO code C23] Move Move Here
(CLASSICAL) BISHOP'S OPG. - Philidor Var.
del Rio Variation
White's King moves to KB1(f1) to prevent 4..QxKtP, 5..QxR and forfeits all chance of castling.
Black's KKt4(g5) Queen moves again, withdrawing to K2(e7) to avoid a 5.P-Q4 fork, and he guards his KBP but loses a tempo.
	White	Black
 1.	P-K4	P-K4
 2.	B-B4	B-B4
 3.	P-QB3	Q-Kt4
 4.	K-B1	Q-K2
WHITE to Move or Undo or Jump or Clear
 
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