up to 3♠ bidding ok i think,the problem is after that how to bid?from South view N sd hv ♠6+ at least but not solid and no extra hcp otherwise cant bid 1♠/2♠/3♠ this way.and South holds some very important key cards:♠Q(even single),♥A,♣A and ♦K,all these r hard points not soft points like KQJ, and 15hcp must reach a game with pd openning bid. now u might know what i want to bid:4♠! with South hand. by the way i wd like to say if i were North i wd change 3N to 4♠ for sure.if play 3N how can assure the long ♠ suit will be useful?Does ♥K,♣Q promise to get entry.obviously that's hard job to work 3N contract.