Chess Board
[ECO code C65]
TRANSPOSITION
RUY LOPEZ (Berlin Def.) to LOPEZ 4KTS. GAME
Black's KKt counter-attacked against White's KP to offset an ongoing threat of 4.BxKt..PxB, 5.KtxP.
White often deploys a Queen's Knight defence of his KP, transposing into the Four Knights Game main - a safe but dull move inviting a 4..B-QKt5 pin. W-Alt.
    White  Black    Transp.White Black
 1. P-K4   P-K4		  (1.)
 2. Kt-KB3 Kt-QB3	  (2.)
 3. B-Kt5  Kt-B3    (3.	Kt-B3  Kt-B3)
 4. Kt-B3	    (4.	B-Kt5	    )
Continue: Transpose or Undo or Jump or Clear