ROPI DOPI
After interference over the Blackwood or Gerber (or any other asking bid) ask, a
(Re)Double = 0 aces
Pass = 1 ace
next bid = 2 aces
etc
Example:
partner opponent you
4NT 5S double = 0 aces
pass = 1 ace
5NT = 2 aces
6C = 3 aces
4C double re-double = 0 aces
pass = 1 ace
4D = 2 aces
4H = 3 aces
OTHER similar conventions are
PODI PORI where pass = 0 and (re)double = 1
REPO DEPO where pass = odd (1 or 3) and (re)double = even (0 or 2)