| DONT - 
    A defensive bidding system against opponents 1 Notrump opening bid, whose acronym 
    is Disturbing Opener's Notrump opening bid (occasionally call Bergen Over 
Notrump): 
      
        | Bid | Meaning |  
        | Double | One suited hand; partner 
        normally "puppets" by bidding 2C.  Overcaller then bids their suit 
        or passes if Clubs was the long suit. |  
        | 2C | Clubs & higher Suit |  
        | 2D | Diamonds & higher Suit |  
        | 2H | Hearts & Spades |  
        | 2S | Spades, weaker than 
        double followed by 2S |  
        | 2N | Clubs and Diamonds |    
  
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  (1 Notrump) 
   |  
        |  |  Q 9 8 
  A J 10 9 6 4 3 
  2 
  5 4 |  |  (1N) - X 
        Double shows a one-suited hand;  if West passes, North normally 
        bids 2C and South shows the long suit - Hearts.  The overcaller's 2 
        level bid is a signoff bid; however, with extra values, North may raise 
        South to invite game. 
          
  
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  (1 Notrump) 
   |  
        |  |  A K J 9 2 
  A J 6 4 3 
  2 
  5 4 |  |  (1N) - 2H 
        2H shows a two-suited hand, Hearts and Spades. 
          
      
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  (1 Notrump) 
   |  
        |  |  A K J 9 8 7 2 
  2 
  3 2 
  5 4 |  |  (1N) - 2S 
        2S shows a weak hand with a long Spade holding - with a stronger 
        hand, South might first double and later bid 2S. |