| Robinson 
    - A defensive response against opponents' Big Club system: (1C) - ? 
      
        | X | Strong Hand (16+ HCP) |  
        | 1D | Black or Red two-suited 
        hand |  
        | 1H | Major or minor 
        two-suited hand |  
        | 1S | Natural, may be weak |  
        | 1N | One shaped hand 
        (Spades and Diamonds or Hearts and Clubs) |  |