Deal 14
 
  3NT
OL: ♠5
♠ 7
5 3 2
7 3
♣ A K J 9 6 4 2
 
 WEST  NORTH  EAST  SOUTH
1NT
pass3NTpasspass
pass

You are West. The bidding has been as shown.
You led the ♠5, East plays the ♠10 and South wins the ♠K.
To the second trick South plays the ♣10 and you must discard something.

When you have made your choice click NEXT .
♠ J 9 6 5 2
A Q 10 6
9 5 4 2
♣ --
♠ 10


  ♠ K


 

 
Deal 14
 
  3NT
OL: ♠5
♠ 7
5 3 2
7 3
♣ A K J 9 6 4 2
  Play the ♠J.

You know that East has no high ♠ honor or he would have played it to the first trick.
So South has the ♠ A Q left, plus all those ♣ tricks.
You need to have West switch to a if possible.

East must be expecting to lead a ♠ back when he wins the ♣Q which you hope he holds.
Your ♠J discard may make him rethink. If your ♠s were any good why would you be discarding a winner when all you had to do was toss a small red card?

Hopefully East will come to the conclusion that this is Suit Preference for a return and will play his J. Hopefully.

 Deal 15 
♠ J 9 6 5 2
A Q 10 6
9 5 4 2
♣ --
♠ 10 8 4
J 7 4
K Q 8 6
♣ Q 7 3
  ♠ A K Q 3
K 9 8
A J 10
♣ 10 8 5