Deal 12
 
  4♠
OL: A
♠ A 10 3
10 6
9 7 2
♣ K Q J 3 2
 
 WEST  NORTH  EAST  SOUTH
1♠
pass3♠pass4♠
passpasspass

You are West. The bidding has been as shown.
You led the A, East puts on the Q. It's your play.

When you have made your choice click NEXT .
♠ 9 5 4
A K 7 2
A 8 6 3
♣ 9 5

Q

 
5

 

 
Deal 12
 
  4♠
OL: A
♠ A 10 3
10 6
9 7 2
♣ K Q J 3 2
  Play the 2.

East's Q is either a singleton, (practically impossible), or a signal showing that he also holds the J. In either case you can reach the East hand on the second trick by playing a low .
Since you don't particularly want to start playing s from your side, you go ahead and play a small , won by East with the J.

East next plays the Q and however South tries it your side will take the next two tricks and set the contract.

 Deal 13 
♠ 9 5 4
A K 7 2
A 8 6 3
♣ 9 5
♠ 8
Q J 8 4 3
Q J 10 4
♣ 8 7 6
  ♠ K Q J 7 5 2
9 5
K 5
♣ A 10 4