Chess Board
[ECO code C68]
RUY LOPEZ - Morphy Def.
Exchange Var. - Keres Variation
White pushes his Queen's Pawn out to Q3(d3) increasing his KP support and freeing his QB.
Black develops his Queen to Q3(d6) and can now castle long, with equality.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	P-KR3  BxKt
 2. Kt-KB3 Kt-QB3    7.	QxB    B-B4
 3. B-Kt5  P-QR3     8.	P-Q3   Q-Q3
 4. BxKt!? QPxB
 5. Kt-B3  B-KKt5
Example ends: Undo or Jump or Clear