Deal 11
 
  6
OL: Q
♠ K 6
8 5 2
9 7 5 4 2
♣ Q 7 3
 
 WEST  NORTH  EAST  SOUTH
2♣
pass2pass2
pass3pass6
passpasspass

You are East. The bidding has been as shown.
Partner led the Q, you signaled with the 8 and South won the A.

South then played low to dummy's ♠K, and led dummy's ♠6.
Your decision is not whether to play high or low, but whether to ruff or not, which amounts to the same thing.

When you have made your choice click NEXT .
♠ 2

Q
♠ 7
9 6 4
K 8 6 3
♣ J 10 8 6 2
  ♠ 4

A
 

 
Deal 11
 
  6
OL: Q
♠ K 6
8 5 2
9 7 5 4 2
♣ Q 7 3
  Do not ruff.

Even though South holds the ♠A, if you ruff now he will just put on a small ♠ and you will be ruffing a loser. Instead discard a .

South will win the ♠A, but will not be able to ruff any ♠ losers in dummy because your trumps can overruff any of North's trumps.

Suppose you had ruffed the ♠. South would have played his ♠9, leaving himself with ♠ A J. He would then get the lead and pull your two remaining trumps.
That would leave one trump in dummy to ruff his ♠J, his only remaining loser.

 Deal 12 
♠ Q 10 8 5 3 2
7 3
Q J 10
♣ 9 4
♠ 7
9 6 4
K 8 6 3
♣ J 10 8 6 2
  ♠ A J 9 4
A K Q J 10
A
♣ A K 5