While they may sound like the names of some  of the Seven Dwarves, DOPI, ROPI and DEPO are actually conventional treatments designed to combat interference with Blackwood sequences.
DOPI and ROPI are better when the opponents’ suit is lower-ranking than yours, while DEPO is better when their suit is higher-ranking.
Some examples will help. Say the auction goes like this, with your side vulnerable:
UD    LHO    Partner     RHO
1
  3
(1)Â Â Â Â 4NT(2)Â Â Â Â 5
?
(1) Preemptive.
(2) Blackwood or Roman Key Card Blackwood.
The opponents are being pests, sacrificing in clubs or just trying to screw up your auction. How do you combat this?
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