Chess Board
[ECO code C42] Move Move Here
PETROFF TRANSPOSITION
MAIN LINE to RUY LOPEZ VARIATION
White advanced his QP (freeing his QB) and may intend a further P-Q5(d5) advance.
Black's Queen to K2(e7) allows 6..Kt-QB6+disc.ch, 7..KtxQ or 6..Kt-KB3+disc.ch. But inferior. B-Alt.
    White  Black    Transp.White Black
 1. P-K4   P-K4		  (1.)
 2. Kt-KB3 Kt-KB3	  (2.)
 3. KtxP   P-Q3	    (3.	KtxP   Q-K2)
 4. Kt-KB3 KtxP	    (4.	P-Q4   P-Q3)
 5. P-Q4   Q-K2	    (5.	Kt-KB3 KtxP)
WHITE to Move or Undo or Jump or Clear
 
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