Can discard after drawing trumps

Can discard after drawing trumps

Q 9 5
A 3
K J 6 5 2
8 4 3
N
W   E
 
S
A K 4 3 2
K 9 5
Q 7
Q J 10

Contract:

4 by South

Lead:

K

West starts with AK and switches to Q. Plan the play.