When Stayman gets doubled
     
 
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When Stayman gets doubled.

 
 

When you open 1NT, and partner bids 2♣ , then you have just three bids at your disposal (playing Standard Garbage Stayman) - 2♦, 2♥, and 2♠. The two extra bids (pass and redouble) when 2♣ is doubled really need to be defined. They could have been put to good use on this deal from news-sheet 217.

 
     
 
Dealer: ♠ A1095     Table A    
South ♥ AJ109     West North East South
Both vul ♦ J3     - - - pass
    ♣ AJ2     pass 1NT (1) pass 2♣ (2)
♠ Q4 ♠ K62 dbl (3) 2♥ . (4) all pass  
♥
K64
♥ 852        
♦ K109 ♦ AQ52 'Expert' Table    
♣ K10854 ♣ Q93 West North East South
    ♠ J873     - - - pass
    ♥ Q73     pass 1NT (1) pass 2♣ (2)
    ♦ 8764     pass pass (4) pass 2♥ (5)
    ♣ 76     pass 2♠. .(6) all pass  
 
     
 
Table A: (1) I totally agree with this North's choice of 1NT – those 109 combinations in 4-card suits are easily worth a point.
   
  (2)

Pass may work out better, but this is a fairly standard Garbage Stayman situation – bid 2♣ and pass whatever partner responds.

   
  (3)

A double of Stayman shows ♣'s and asks for a ♣ lead.

  (4)

With no agreement here I guess that North has to bid 2♥?

'Expert' Table (1) But our experts do have an agreement of course, it is defined below and this pass shows 4-4 in the majors.
 
  (5)

And our experts have another trick up their sleeved here - 2♥ is a transfer to get the 1NT opener as declarer.

   
  (6)

North completes the transfer.

     
 
 

2♥ plays fairly well (better than 1NT) but 2♠ is easily the best spot for N-S.

 
     
 

When Stayman 2♣ is doubled that gives opener two extra bids (pass and redouble) and these really should be put to good use by experienced partnerships. One scheme is: -

 
     
 
pass = 4-4 in the majors.
redbl =

good ♣'s and denying a 4-card major, offering 2 ♣ redoubled as a final contract if responder has good clubs, and showing good ♣ stops in the more likely scenario that he does not.

   
   
2♦ = no 4-card major.
2♥/♠ = a 4 (or 5 card suit) but not 4-4 in the majors.
 
     
 
After 1NT pass 2♣ dbl pass pass then responder knows that opener is 4-4 in the majors. He should bid 2♦/♥ to transfer into the best fit and then pass, invite or bid on as appropriate.
 
 
 
     
 

This is one treatment; another is to play pass as equal length (so normally 3-3 or 4-4) in the majors. This would work better when opener is 3-3 in the majors and responder has just one 4-card major and wishes to play in a possible Moysian fit. But if responder has game ambitions he really needs to know if partner has a 4-card major, so I think that the method given is probably superior.

 
     
  Yet another treatment is to play that 2♦ promises 4+ ♦'s and denies a 4 card major. This would well if partner has bid Garbage Stayman on a weak 4441 type hand (quite likely on the bidding). Redouble should still show ♣'s and pass would deny 4 ♦'s, 4 ♥'s or 4 ♠'s and thus presumably show 4+ weak ♣'s (no redouble). I guess this works but it's unlikely for opener to have a hand with 3 or less ♦'s, ♥'s and ♠'s where he cannot redouble. This topic came up in News-Sheet 265 and opener actually has a clear redouble. I suppose that this would be the 'standard' treatment if you had not agreed either of the above?  
     
     
 
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