♠ A K Q J 9
K 5 3
A 10 3
♣ K 6
You are East. Your partner, West, leads the 7 against South's 3NT contract.
The 3 is played from dummy. What do you play?

Scroll down for the answer.
♠     
7   
   
♣  
N
W        E
S
♠ 10 7 2
A J 9 2
8 5 4
♣ A 10 3
♠  
 
 
♣  
















♠ A K Q J 9
K 5 3
A 10 3
♣ K 6
You are East. Your partner, West, leads the 7 against South's 3NT contract.
The 3 is played from dummy. What do you play?

11 - 7 = 4. There are 4 cards between dummy, you, and declarer that can beat the 7. You can see all 4 of them in your hand and dummy, so declarer cannot beat the 7.
Therefore you play your 2 and let partner play s again from her side. You will win 4 tricks and the ♣A, defeating the contract by one trick.

If you play any other on the first trick you cannot prevent declarer from making the contract.
♠ 6 4 3
Q 10 8 7
9 7 6 2
♣ J 5
N
W        E
S
♠ 10 7 2
A J 9 2
8 5 4
♣ A 10 3
♠ 8 5
6 4
K Q J
♣ Q 9 8 7 4 2