In Competition

Opps overcall our 1 NT or 2NT opening bid with transfer

We use the same after "suction" conventional interference (we ignore 2 suiter possibility)

After 1NT - (2♣) -    ➤    dbl = Heeman, other = system on

After 1NT - (2♦/♥/♠) -

DBL    =    shows suit bid by Opps

bid of suit implied by opps    =    T/O

other    =    Rubensohl