South opened 1NT showing 9-14 HCP, 4 of a Major and 5+ clubs. It was not alerted, but West asked about it at his turn to bid and was told
by North 16-18 HCP, balanced. North then bid 2D which was alerted as a transfer to hearts, East inserted 3D and South bid 3H. I'm not sure
what happened after that - I think they ended up in 5H making. I was just asked the question about the legality of the 3H bid after the session
was over. Their system is that the 1NT overcall is as South bid it, North just forgot. The reply to the enquiry by North should have been
UI to South - did he take advantage of it? A 2D response by North is impossible in their system apparently.