|  Negative Slam Double 
    - A Double of opponent's slam used to indicate either a willingness to 
    continue bidding or penalize the opponents (various treatments are 
    available, including the negative and positive slam Double).   
    Example:  (1H) - 2S - (4H) - 4S;(6H) - X
 This Double indicates the 
    player has no defensive tricks and, assuming partner's hand is limited to 
    offensive values , suggests partner make a sacrifice slam bid (usually with favorable vulnerability). See books on
     
        Slam and other slam conventions:
     
        1430,
        Baby Blackwood, 
        
        Blackwood, Controls,
    Exclusion Blackwood - 
    Voidwood, Gerber,  
        Grand Slam Force,
    Jacoby 2 Notrump,
    Key Card Blackwood, 
    Kickback,  
        Last Train,  NAMYATS,
    Pick a Slam,
    Quantitative Notrump Bid,
    Rolling Blackwood,
    Serious 3 Notrump,
    Slam Try - Stayman,
    Splinters,
    Opener 
    Jump Shift,
    Strong Jump Shift, and legacy treatments as 
        Roman Asking Bids,
    Roman Blackwood,
        Roman Gerber.  Slam 
        treatments 
    also include interference of 
    an overcall by opponents, as 
        Negative Slam Double,
    DOPI,
        DEPO, ROPI. |