Deal 5
 
  3NT
♠ K 5 3
A J 8
Q 9 6
♣ Q J 5 2
 
 WEST  NORTH  EAST  SOUTH
1NT
pass3NTpasspass
pass

The bidding has been as shown.
Partner led the ♠7, dummy played the ♠3 and it is your play.

When you have made your choice click NEXT .
♠ 7


♠ A J 9 2
10 7 5 3
A 4 2
♣ 9 7
 


 

 
Deal 5
 
  3NT
♠ K 5 3
A J 8
Q 9 6
♣ Q J 5 2
  Play the ♠2.

Partner has led a small card, so it is surely fourth-down.
That means you should automatically apply the Rule of Eleven.

11 minus 7 equals 4, so there are just 4 cards higher than the 7 between dummy, you, and declarer.
AND YOU CAN SEE ALL FOUR OF THEM.

Declarer has no card that can beat the ♠7, and the only way you can beat this contract is to let partner's ♠7 hold the trick.
He will continue the suit, allowing you to pick up dummy's ♠K and four ♠ winners.
Along with the A you will defeat the contract.

If you play ANY card except your ♠2 on the first trick you will not be able to win four tricks in the suit because you cannot get West back into the lead. And declarer will make the contract easily.

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