Chess Board
[ECO code C67] Move Move Here
RUY LOPEZ - Open Berlin Def.
(The) Side Variation
White's usual pawn to Q4(d4) formed a joint attack on Black's KP and threatened P-Q5 - the main.
Black's Queen's Pawn out to Q3(d6) switches his KP defence, "closes" his KB and frees his QB - but a dubious move, likely to cost him a piece. B-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	P-Q4   P-Q3?!
 2. Kt-KB3 Kt-QB3
 3. B-Kt5  Kt-B3
 4. 0-0    KtxP	   Equiv. 5B,4B route
WHITE to Move or Undo or Jump or Clear
 
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