Chess Board
[ECO code C48]
LOPEZ FOUR KNIGHTS GAME
The Rosenthal Variation

Black's pawn to Q3(d6) switched his KP defence and freed his QB. Constricted (a QKt self-pin) but solid.
White sets his Queen's Pawn on Q3(d3), frees his QB and doubles the support for his KP. W-Alt.
	White   Black
 1.	P-K4    P-K4
 2.	Kt-KB3  Kt-QB3
 3.	Kt-B3   Kt-B3
 4.	B-Kt5   P-Q3
 5.	P-Q3

Example ends: Undo or Jump or Clear