Deal 16
 
  4♠
OL: ♣K
♠ Q J 9 8 6 3
Q 7 2
Q 8 4
♣ J
 
 WEST  NORTH  EAST  SOUTH
1♠
pass4♠passpass
pass

You are East. The bidding has been as shown.
Partner led the ♣K, dummy's singleton was played and it is your play.

When you have made your choice click NEXT .



♣ K
♠ 2
A K J
J 10 6 3 2
♣ A 9 7 2
 


 

 
Deal 16
 
  4♠
OL: ♣K
♠ Q J 9 8 6 3
Q 7 2
Q 8 4
♣ J
  Play the ♣9.

West will look at your ♣9 and perhaps think for an instant that you want him to play another ♣.

But it will be a short instant because a look at dummy makes in absolutely clear to everybody that playing another ♣ could not help your side. Dummy has so many trumps that repeated ♣ leads would do nothing.

OK. If it's not an encouraging Attitude signal, what is it?
Suit preference of course. Since it is a high spot card you are asking West to switch to the higher suit (choosing between s and s).

West dutifully plays a and you take the next three tricks.
Had he switched to a instead, South would have been able to discard one of his losers on North's Q.

 Deal 17 
♠ 10
9 6 4 3
9 7 5
♣ K Q 10 6 3
♠ 2
A K J
J 10 6 3 2
♣ A 9 7 2
  ♠ A K 7 5 4
10 8 5
A K
♣ 8 5 4