Deal 15
 
  3NT
♠ 6 5 2
J 9 8
9 5
♣ K J 10 9 7
 
 WEST  NORTH  EAST  SOUTH
1double
pass2♣pass2NT
pass3NTpasspass
pass

The bidding has been as shown.
Partner led the 10, dummy played the J and it is your play.

When you have made your choice click NEXT .

10

♠ Q J 9 7
K Q 6 5 3
10
♣ A 6 4
 


 

 
Deal 15
 
  3NT
♠ 6 5 2
J 9 8
9 5
♣ K J 10 9 7
  Play the 6.

Declarer gets two winners whether you play one of your honors on this trick or not.
So why does it matter what you do?

Suppose you cover with your Q. South will win his A, then play ♣s until your ♣A is forced out on the third round. He can then force an entry to dummy in the suit to reach the two ♣ winners.

Now suppose you duck the J.
Again South will push ♣s, and again you hold up until the third round.
Ahh, what a difference. Now declarer cannot use the s to enter dummy and he will never get to enjoy those two ♣ winners.

 Deal 16 
♠ 10 8 3
10 2
Q J 8 6 4 2
♣ 8 3
♠ Q J 9 7
K Q 6 5 3
10
♣ A 6 4
  ♠ A K 4
A 7 4
A K 7 3
♣ Q 5 2