| ROPI 
    - An acronym 
    Redouble = 0, Pass = 1, used to indicate Aces or 
    keycards when an opponent has interfered with a slam-asking sequence as 
    Gerber or Blackwood. 
      
        | Bid | Meaning |  
        | Redouble | 0 Aces |  
        | Pass | 1 Ace |  
        | Next bid | 2 Aces, etc |  Some partners 
    instead use keycard responses:RKC: 0/3 = Redouble, 1/4 = Pass
 1430: 1/4 = Redouble, 0/3 = Pass
 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. |