Lebensohl

Lebensohl is used when opponents intervene over partner's 1 NT opening. The objective is to differentiate
among weak competitive hands, intermediate hands and strong hands.
The responses use an artificial 2N bid to relay. The general scheme is:
1. 2 level bids are merely competitive
2. 3 level bids are forcing
3. 3 level cue bid shows 4 card major and no stopper in the overcalled suit; 3 NT shows no check in the overcalled suit
4. 2NT is used as an artificial relay; opener bids 3C
   responder can pass
   or correct by bidding a suit below the overcalled suit
   or invite by bidding a suit above the overcalled suit;
   a cue bid or 3NT now has a similar meaning as above but promises a stopper in the overcalled suit

Open Int Resp    
         
1N 2D Dbl Penalty *1
    2H,2S 5 card suit, to play  
    2N Asks opener to bid 3C, responder will pass  
      After opener rebids 3C, responder can force as follows:  
        (opener rebids 3C) 3D: game force, 4 card major, diamond stopper  
        (opener rebids 3C) 3H,3S: 5+ cards, invitational  
        (opener rebids 3C) 3N: game force, no major, diamond stopper  
    3C Game force, suit  
    3D Game force, one 4 card major, no diamond stopper  
    3H,3S Game force, 5+ cards  
    3N Game force, no 4 card major, no diamond stopper  
         
1N 2H Dbl Penalty *1
    2S 5 card suit, to play  
    2N Asks opener to bid 3C, responder will pass or bid suit (weak)  
      After opener rebids 3C, responder can force as follows:  
        (opener rebids 3C) 3H: game force, 4 card spades, heart stopper  
        (opener rebids 3C) 3S: 5+ cards, invitational  
        (opener rebids 3C) 3N: game force, less than 4 spades, heart stopper  
    3C,3D Game force, suit  
    3H Game force, 4 card spades, no heart stopper  
    3S Game force, 5+ card spades  
    3N Game force, less than 4 card spades, no heart stopper  
*1 The double could be played as negative

After a 3 level overcall, double is takeout, bid below game is forcing,
game bid is signoff, three notrump shows stopper.

Lebensohl after weak two bids:

Opps Prtnr Resp    
         
2H Dbl   Opening hand or better; may not have 4 card spades  
    2S 5 card suit, to play  
    2N Asks opener to bid 3C, responder will pass or bid suit( 0-7 pts )  
      After opener rebids 3C, responder can force as follows:  
        (opener rebids 3C) 3H: game force, 4 card spades, heart stopper  
        (opener rebids 3C) 3S: 5+ card spades (partner bids 3N or 4S)  
        (opener rebids 3C) 3N: game force, less than 4 spades, heart stopper  
      With a strong hand, the doubler will not bid 3C *2
    3C,3D 7-11 pts, 5+ card suit  
    3H Game force, 4 card spades, no heart stopper  
    3S Game force, 5+ card spades  
    3N Game force, less than 4 spades, no heart stopper  
*2 For example, if doubler has 17 pts and 5 diamonds, doubler could bid 3D;
    if doubler has 20 pts and a stopper in hearts, doubler could bid 3N.

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