1NT

Nick name

weak no trump 
  probablility of using this opening :
8,75%
Conditions
  • no 5 card (35%) : 4432 ( %) - 4333 ( %) - 4441 ( %)
  • 12-15hcp (25%) : 12-13 = min 14-15 = max
>>supplementary notes <<home
Responses   Rebid opener   Rebid partner  Rebid opener 
2

10+hcp
all distributions exc. 5c major

(or 6-7hp when applied after 1-1-1NT)

asks for strength and for 4c major

 

2 
2x4c major, min 
2/2/2NT end
3
MSA
3/
3c /
3/3NT
4c /
2/
4c /, min
pass/2NT end 
 
3
MSA
step12-3
4c / - none
2NT
no 4c /, min
pass
end 

3

MSA

step1-23

both - /

3
4c , max
3
MSA step12-3
4c / - none
3
4c , max
3
MSA step12-3
4c / - none
3
2x4c major, max 
3
MSA step12-3
3c /
3
no 4c /, max
3NT
end  
4
MSA step12-3
both-/
3NT
4441, sn, max pass/4NT end / MARC  
4
4441, sn, max
4
bid 4NT-end
4
4441, sn, max
4
bid 4NT-end
4
4441, sn, max
4
bid 4NT-end
 
2/
 

     Transfer for  /

weak, limit, strong or very strong

 2/ 2+c support  
 2NT
 10-11hp  
 2 after 2  54, 10-11hp
 3
 how well is support ? step123 min,2/3/4c
step456 max,2/3/4c
step1 4441, min endbid/MARC  
step2 4441, max endbid/MARC
 
2 10-11hp, 54xx  
2NT long weak in a suit 3 P/C  
3/ 10-11hp, 5+c  
3 8-9hp, 55
3NT 12+hp, 55/
 
When getting overcalled ....
- 1NT-double- ...
  • pass = either 9+hp, any distribution either weak with 2x4+card in the shaped suits ( - ). When RHO passes opener will redouble. With a 9+hp holding the partenr will pass, with less het bid the lower of the two promised suits.
  • 2 = 2x4+card in
  • 2 = 2x4+card in
  • 2 = 2x4+card in
  • 2 = 2x4+card in
  • redouble = weak with one 5+card suit. Opener must bid 2 when his RHO passes.
 
-1NT-2x-..
  • double = 9+hp
  • 2y : 5card in y , competitive
  • 2NT : 10-11 with stop in x
 
 
-1NT-pass-pass- double -.. - pass ! Probably LHO bids. If not, it is the partner who must take action : either pass with 7-9hps, either bid a 5card suit, either SOS-redouble.