BridgeHands

En passant - A favorably-placed low value trump, located behind opponents' higher trump.

	A x
x x		9 A
	2 x

Spades are trump.  Declarer leads Dummy's HA.  East can ruff with the S9, but then loses DA to South's S2.  Had East been on lead, West could lead the S9 first, knocking out declarer's low trump to win an extra trick.