Chess Board
[ECO code C20]
The Hippopotamus Variation

White developed his KKt defensively to K2(e2) to reserve the option of a defended 3.P-KB4.
Black develops his Queen to KR5(h4), attacking White's KP and pinning White's KBP+K. This line continues for a famous smothered mate by Black (the "Hippopotamus Game") in six moves. B-Alt.
	White	Black
 1.	P-K4	P-K4
 2.	Kt-K2	Q-R5

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