Deal 1
 
 
 
♠ A Q 3 2
5 4 3
4 3 2
♣ 4 3 2
 
 WEST  NORTH  EAST  SOUTH
2♣
pass2pass3
pass3♠pass4NT
pass5pass7NT
passpasspass

Never mind the bidding.
South is to play 7NT. West leads the ♣Q.

Make a Plan, then click NEXT .
   
  ♠ K 5 4
A K Q 2
A K Q J
♣ A K
 

 
Deal 1
7NT
OL: ♣Q
 
♠ A Q 3 2
5 4 3
4 3 2
♣ 4 3 2
  You have 12 top tricks. There are no finesses available, but a 3-3 split in either Major suit will provide the 13th trick. As you can see, this is not going to happen.

But there is another possibility; if the same defender holds 4 s and 4 ♠s you will be able to squeeze him in those two suits.

You win the ♣K and play A K Q to test the suit, but West discards a ♣ on the Q. (You tested s first because of dummy's limited entries to the ♠ suit.)

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

 
Deal 1
7NT
OL: ♣Q
 
♠ A Q 3 2
 
4 3 2
♣ 4 3
  Your 2 is not a winner but is a THREAT to become one. East holds the J which is a GUARD against that happening.

Next play your 4 winners, discarding a ♣ from dummy. East follows twice, then starts to feel the pressure. He cannot discard the J because it is guarding your 2, and since he can see those 4 ♠s in dummy he doesn't want to discard a ♠. He discards both his ♣s, trusting West to guard that suit.

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

 
Deal 1
7NT
OL: ♣Q
 
♠ A Q 3 2
 
 
♣ 4
  Now you play the ♣A. At this point you are still hoping the ♠s will split 3-3. They aren't going to, as you see, but something wonderful happens instead. East cannot discard his J because to do so would establish your 2. So he must throw a ♠ instead. You realize your 2 is not a winner so you just play ♠K, ♠A and ♠Q, and amazingly dummy's ♠3 has become your thirteenth trick.

Of course if East had discarded his J you would have cashed your 2 and then taken three ♠ winners.

You just executed a Squeeze Play and you didn't even have to try.

 NEXT 
♠ 7 6
 
 
♣ J 9 8
♠ J 10 9 8
J
 
♣  
  ♠ K 5 4
2
 
♣ A
 

 
Deal 1
7NT
OL: ♣Q
 
♠ A Q 3 2
 
 
♣ 4
  This type of squeeze is called an automatic squeeze because it operates equally well against either defender. Suppose the EW hands were switched. Of course the opening lead would have been different, but when you were ready to play your ninth winner the hands would have looked like this.

This time it is West who holds the only Guards in both ♠s and s.

You play the ♣A and he must give up one of those Guards.

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