If Opener bids a new suit at the three-level over Responder's two-over-one, it shows extra values. 1)1S-2H;3m 2)1S-2D;3C With a four-card suit, Opener needs at least 15 HCPs. To bid a new suit at the three-level, Opener doesn't need as much extra strength with a five-card or longer second suit. South lack for controls and have only 9HCP(H:AQ C:K) in his main suit. North have semi-solid D suit and 6controls, rebid 4D after 3N is my choice. Pass 3NT was passive.