| 
    TWERB: Two Way Exclusion Relay Bidding - An adoption of the 
    Suction 
    convention, primarily used as a defensive countermeasure against opponents 1 Notrump 
    opening bid.  Most TWERB conventional calls are similar to Suction, 
    with a few additions: 
      
        |  | TWERB | SUCTION |  
        | (1N) - 2C | Diamonds, or Hearts and Spades | Diamonds, or Hearts and Spades |  
        | (1N) - 2D | Hearts, or Spades and Clubs | Hearts, or Spades and Clubs |  
        | (1N) - 2H | Spades, or Clubs and Diamonds | Spades, or Clubs and Diamonds |  
        | (1N) - 2S | Either of these two suited:Pointed - Spades and Diamonds
 Rounded - Hearts and Clubs
 | Clubs, or Diamonds and Hearts |  
        | (1N) - 2N | Clubs, or Diamonds and Hearts |  |    |