Bergen Over 2NT
Two-Suited Hands (at least 6-5):
3 = Diamonds and Hearts/Spades
3 = Hearts and Spades
Partner passes with a fit or bids the next higher suit to ask overcaller to show his 2nd suit. If the next higher suit is overcaller's second suit, he will pass; otherwise, he bids the 2nd suit.
If the overcall is doubled for penalty, a redouble by responder is S.O.S, asking overcaller to bid his second suit.