♠ K Q 9 2
8 3
J 10 4
♣ A Q 6 5
South is playing 3NT. Your partner, West, leads the 6.
You play the J and South wins the first trick with the K.
South crosses to the ♠K and plays the J.

How will you defend? (scroll down)
♠    
6   
   
♣  
N
W        E
S
♠ 10 7 5 4
J 9 7
A 8 2
♣ J 9 3
♠  
 
 
♣  
















♠ K Q 9 2
8 3
J 10 4
♣ A Q 6 5
South is playing 3NT. Your partner, West, leads the 6.
You play the J and South wins the first trick with the K.
South crosses to the ♠K and plays the J.

The Rule of Eleven tells you that North, East and South began with just 5 s bigger than the 6.
You and dummy had 4 of them, so South's K was his only high .
Therefore your partner still has  A Q 10 and perhaps another one. You should jump in with your A at once and play a .

If you hold up and let South take just one trick she will make 9 tricks.
♠ 8 3
A Q 10 6 2
7 3
♣ 10 7 4 2
N
W        E
S
♠ 10 7 5 4
J 9 7
A 8 2
♣ J 9 3
♠ A J 6
K 5 4
K Q 9 6 5
♣ K 8