Deal 8
 
  3NT
OL: 4
♠ K Q 9 3
8 7 3
Q 6
♣ 9 7 6 4
 
 WEST  NORTH  EAST  SOUTH
1♣
pass1♠pass2NT
pass3NTpasspass
pass

You are West. The bidding has been as shown.
You led the 4, East plays the J, won by South with A.

South plays the ♠J, you follow with ♠5, dummy ♠3 and East plays the ♠2.
South continues with the ♠10 and it is your play.

When you have made your choice click NEXT .
♠ A 6 5
Q 10 6 4
K 7 2
♣ 10 5 2
♠ 2
J

  ♠ J 10
A

 

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

East's ♠2 tells you he had an ODD number of ♠s, obviously 3.
Since South also must have 3, you must take your ♠A on the third round, depriving dummy of the extra ♠ trick.

South may now turn to the suit, but your side can win the first and drive out South's K.
You will win 2 s, 2 s and the ♠A, down 1

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