Frozen - To avoid breaking a suit to minimize losing tricks.
Q 9 5 x x x x x x x x x x
J 8 7 6 x x x x x x x x x
K 10 3 x x x x x x x x x x
A 4 2 x x x x x x x x x x
Both sides should
freeze the Spade suit. If East/West break Spades, North/South win
2 tricks (SQ and SA). If North/South break Spades, they only take
one trick - the SA.