Chess Board
[ECO code B06]
Modern (aka. Robatsch) Defence
PIRC DEFENCE DEFERRED
White reserved Q-side options, developing his king's bishop to K2(e2) to deter a KKt pin, and enabled 0-0.
Black's irregular King's Pawn to K3(e3) for ..KKt-K2 (a Hippopotamus Defence) was seen in Petrosian-Spassky, W.Championship 1966 (game 16). B-Alt.
	White   Black
 1.	P-K4    P-KKt3
 2.	P-Q4    B-Kt2
 3.	Kt-KB3  P-Q3
 4.	B-K2    P-K3!?
Example ends: Undo or Jump or Clear