Deal 13
 
  6NT
OL: 10
♠ K Q 5
A 6 3
A 8 2
♣ A J 4 3
 
 WEST  NORTH  EAST  SOUTH
1NT
pass6NTpasspass
pass

You are East. The bidding has been as shown.

Partner led the 10, won by dummy's A.
At trick 2 South calls for dummy's ♣3.
Which card do you play?

When you have made your choice click NEXT .

10

♠ 10 8 4 3
J 5 2
10 4
♣ K 10 8 6
 
4

 

 
Deal 13
 
  6NT
OL: 10
♠ K Q 5
A 6 3
A 8 2
♣ A J 4 3
  Play the ♣6.

You would not have been expecting South to play a small ♣ from dummy's holding.
The only way it makes sense is if South holds the ♣Q.

If you play your ♣K you will win the trick, but in so doing you will set up 3 ♣ tricks for South, which is all he needs to make the slam.

Play low instead and South will win his ♣Q.
But now your ♣ K 10 sits behind dummy's ♣ J 4 so he can get only one more trick in the suit, the ♣A.

 Deal 14 
♠ 9 7 6
10 9 8 7
J 9 6 3
♣ 9 5
♠ 10 8 4 3
J 5 2
10 4
♣ K 10 8 6
  ♠ A J 2
K Q 4
K Q 7 5
♣ Q 7 2