Deal 11
 
  3♠
♠ A Q 8 3
10 6
7 5 2
♣ A K Q 5
 
 WEST  NORTH  EAST  SOUTH
1♣pass1♠
23♠passpass
pass

The bidding has been as shown.
Partner led the Q, dummy played the 6 and it is your play.

When you have made your choice click NEXT .

Q

♠ 7 4
A K 4
10 9 8 4
♣ 10 8 4 2
 


 

 
Deal 11
 
  3NT
♠ A Q 8 3
10 6
7 5 2
♣ A K Q 5
  Overtake with the K.

Your side needs to take 5 tricks to defeat this contract.
Two of them will be s, but it doesn't look like you can win any ♣s or ♠s.

That means you need to win 3 tricks and the only way that can happen is if you play s from your side.

So win the first K (so partner will know you also have the A), and play the 10. Presumably South will play an honor, but West will take the trick and put you back on lead with your A.
You play the 9 and your side will collect 3 tricks to go with your 2s.

 Deal 12 
♠ K 5
Q J 9 7 2
A Q 6
♣ 9 7 3
♠ 7 4
A K 4
10 9 8 4
♣ 10 8 4 2
  ♠ J 10 9 6 2
8 5 3
K J 3
♣ J 6