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Detail specifications 12OK - Level 3 ★

Opener's rebid of 2NT

WIP
After an opening at level 1 and a level 1 response , With a 3rd zone opening and 4 cards in ♠, should you bid 1♠ ?
TIt all depends on your strength in the 4th suit !
  • If you fear a lead in the 4th suit, bid 1 ♠
  • If you are not afraid of a a lead in the 4th suit, bid 1NT
You'll be able to find the best part-score, game or slam in BT, à ♠ or even in the responder's suit. The 2NT bid is strong, but non forcing .
Exercice E1866
You are not in danger in the 4th suit. Bid 2NT
 
Exercice 1867
Without a stopper in the 4th suit, look for a potential fit in ♠. No luck here, no fit ! 3NT will make if the opps ♦ break 4-3....