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Blocked suits

A blocked suit is one where either your hand or dummy has only high cards with no accompanying low card. These suits are blocked:
 
  Deal a) Deal b) Deal c)
Dummy  K ♠ KQ  K42
  ------- ------- ------
Declarer  A32 ♠ A32  AQ

Such a suit invariably complicates the communications between your two hands.

Best is normally to unblock the suit as soon as possible. In (a) cash/lead to  K; in (b) cash/ lead to  KQ; in (c) cash/lead to  AQ. Then when you reach the other hand (in another suit), you’ll be able to enjoy the extra winner.

Perhaps you have no way to reach the other hand. In that case, you may have to overtake a winner. In these examples, you have no other way to reach dummy:

  Deal a) Deal b) Deal c)
Dummy ♣ AQ2  KJ32 ♠ K432
  ----- ----- -----
Declarer ♣ K  AQ ♠ AQJ

In (d) you must overtake  K with  A, so at least you can make two club tricks ( Q to follow). In (e) you cash  A and must then overtake  Q with  K, to cash  J. In (f), cash  AQ, then overtake  J with  K in the hope of a 3-3 split and a long card.

Click here to try this deal

South Deals
None Vul
Q 3
6 3 2
Q 5 3 2
A Q 3 2
J 9 8 5
A J 7
9 7 4
8 6 5
 
N
W   E
S
 
K 10 7
K 10 8
10 8 6
10 9 7 4
 
A 6 4 2
Q 9 5 4
A K J
K J
West North East South
      1 1
Pass 2 2 Pass 3 NT3
Pass Pass Pass  
  1. Open 1  with 4 -4  , to facilitate finding either 4-4 major fit.
  2. Cheaper of fours as responder.
  3. 17-19 balanced (although it is recommended – on space-saving grounds – to play a 2 NT rebid after a two-over-one response as 15-19 and forcing to game).
3 NT by South
Made 3

Declarer tried dummy’s  Q on  5 lead – the only chance of winning a trick with the card. East covered with  K and declarer ducked. He won East’s  10 return (for fear of a heart switch) and first unblocked  KJ (no need to overtake, as dummy had a side diamond entry).

At trick five declarer cashed  AK and then led  J. Next came the key play. He overtook  J with  Q, because that was the only way to reach dummy. He had to hope the suit was splitting 3-3 and when he opened his eyes, he saw the good news. He could now cash  AQ and the lowly  5. Nine tricks and game made.

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