The jettison squeeze is a rare variation of a simple squeeze. It occurs when declarer holds a menace that's blocked by a high card in dummy. Declarer may need to discard (unblock) that high card to complete the squeeze.
In the following layout, South's club menace is blocked by dummy's ace.
Dummy
K9
—
West
—
East
A
A
T
—
43
—
South
—
98
—
—
Q
—
T2
South is on lead. When she leads the Q, West gets squeezed. If West discards his A, dummy's king becomes good. But if West opts to discard a club instead, South must jettison the A from dummy. This allows her to score the last two tricks with the T and 2.
"South played in 2NT and West opened 10. South held up until the third round and played diamonds. West waited to see partner's discard on the third diamond; then he switched to a heart, and the queen lost to East's ace. East cashed the thirteenth club, South threw a spade, and led 7, taken by the ace. After a fourth diamond the position was:
Dummy
QT
K
West
—
East
K
—
J
T6
85
—
South
—
—
—
—
J9
T
—
"South led 10 and when West threw a heart, had only to keep his wits about him and discard K from dummy. This artistic squeeze can be played only against the left-hand opponent, that is, it is a one-way squeeze."
See also
Simple Squeeze
A squeeze against one defender in two suits.