Source: self.gutenberg.org

strip squeeze is a declarer technique at contract bridge combining elements of squeeze and endplay.

This squeeze occurs when declarer has two or more losers remaining. By cashing winners, declarer forces the squeezed defender to discard cards so that he cannot defeat the contract. Eventually, the defender will be forced to unguard a potential winner, exposing it to capture or be put on lead and forced to lead a suit that will cost his side a trick.

Examples

Example 1a
South in 6Heart Suit
Spade Suit 3 2
Heart Suit A 6 3 2
Diamond Suit 4 3 2
club suit 4 3 2
Spade Suit K 7 6 5

N

W               E

S

Spade Suit J 10 9 8
Heart Suit 5 4 Heart Suit 7
Diamond Suit 6 5 Diamond Suit J 10 9 8 7
club suit K Q 10 6 5 club suit 9 8 7
Lead: club suitK Spade Suit Q 4
Heart Suit K Q J 10 9 8
Diamond Suit A K Q
club suit A J

South is in a 6Heart Suit contract with 11 top tricks on the club suitK lead. To perform a simple squeeze, South would have to lose a trick at some point to rectify the count. This will not work on this hand because the only menaces South has are in clubs and spades. Ducking a trick in clubs would allow East to guard the suit.
South must rely on a strip squeeze to make the hand. The first club trick is won, and the hearts then the diamonds are cashed.

Example 1b Spade Suit A 3
Heart Suit
Diamond Suit 2
club suit 4
Spade Suit K 7

N

W               E

S

Spade Suit J
Heart Suit Heart Suit
Diamond Suit Diamond Suit J 10
club suit Q 10 club suit 9
South on lead Spade Suit Q 4
Heart Suit
Diamond Suit K
club suit J

 

South remains with Spade SuitQ 4 club suitJ and Spade SuitA3 club suit4 in dummy. West must choose between baring the Spade SuitK or club suitQ. If West keeps Spade SuitK x, South puts West on lead with a club to lead away from the spade. Otherwise, South plays a spade to the Ace to drop West’s King.
An experienced West will try to make things as difficult as possible for South so that the correct route to 12 tricks is not certain. Making the key discard before the final winner is cashed will introduce as much ambiguity as possible. Although in double-dummy it is impossible to go wrong, occasionally South will make the wrong decision in competition.

Squeezes often require declarer to know the location of specific high cards or the number of cards a defender holds in a particular suit, in order to know what cards the squeezee will be forced to play. Examples 2a and 2b illustrates:

Example 2a Spade Suit A J
Heart Suit K
Diamond Suit 2
club suit
Spade Suit K Q

N

W               E

S

Spade Suit 3 2
Heart Suit A Heart Suit
Diamond Suit 7 Diamond Suit Q
club suit club suit 8
South to lead Spade Suit 4
Heart Suit 2
Diamond Suit 3
club suit A
Example 2b Spade Suit A J
Heart Suit K
Diamond Suit 2
club suit
Spade Suit K Q

N

W               E

S

Spade Suit
Heart Suit A Heart Suit
Diamond Suit 7 Diamond Suit Q
club suit club suit 3 2 8
South to lead Spade Suit 4
Heart Suit 2
Diamond Suit 3
club suit A

Again South needs three of the remaining tricks in a notrump contract. In Example 2a the presence of the diamond loser means that when South cashes the club suitA, West is not squeezed. He can safely discard his idle Diamond Suit7. However, when South next plays the Diamond Suit3, West is squeezed again. East wins the Diamond SuitQ, but must lead to dummy’s winners.

In Example 2b East’s Spade Suit3 2 are replaced by the club suit3 2 and declarer must know East’s club length in order to make the correct play. If South cashes the club suitA and then leads the Diamond Suit3, East wins the Diamond SuitQ and will take the rest of the tricks. In this case, the correct play is for South to lose the Diamond SuitQ immediately, before taking the club suitA, in order to rectify the count. Now East is forced to lead a club to South’s ace, and West is squeezed as before.

But with East’s hand as shown in Example 2a, losing the Diamond SuitQ first does not work. East can return a spade, and declarer will score only theSpade SuitA. Not only does the squeeze position disappear, but there is no entry to cash the club suitA.