| RIPO 
    - An acronym 
    Redouble 1 (one), Pass zerO, used to indicate Aces or 
    keycards when an opponent has interfered with a slam-asking sequence as 
    Gerber or Blackwood. ROPI is a more popular treatment 
    than RIPO. 
      
        | Bid | Meaning |  
        | Redouble | 1 or 3 Aces |  
        | Pass | 0 or 2 Aces |  
        | Next bid | Varies by partnership 
        agreement |  An acronym 
    Double Even, Pass Odd, used to indicate Aces or 
    keycards when an opponent has interfered with a slam-asking sequence as 
    Gerber or Blackwood.  Due to some ambiguity over bid meanings, ROPI 
    enjoys a greater following than RIPO. 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.
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