Chess Board
[ECO code C41]
TRANSPOSITION
PHILIDOR'S DEFENCE to RUY LOPEZ (Steinitz Def.)
Black's QB defended his QKt+QR, halving the B pin.
White transposes into a Steinitz Defence of a Ruy Lopez, developing his Queen's Knight to QB3(c3) to defend his bishop and KP against 6..Kt-B3.
    White  Black    Transp.White Black
 1. P-K4   P-K4		  (1.)
 2. Kt-KB3 P-Q3	    (2.	Kt-KB3 Kt-QB3)
 3. P-Q4   PxP	    (3.	B-Kt5  P-Q3  )
 4. KtxP   Kt-QB3   (4.	P-Q4   B-Q2  )
 5. B-QKt5 B-Q2	    (5.	Kt-B3  PxP   )
 6. Kt-QB3	    (6.	KtxP	     )
Continue: Transpose or Undo or Jump or Clear