MP's
1NT=15-17 (can sometimes be an upgraded 14 and sometimes 5cM)
You play some kind of relays after 1NT.
- 2♣ is either weak with ♦ or some other inv+ hands.
- You don't have regular stayman. You can invite with 4cH by transferring to H (2D) and bidding 2NT. If you bid 2D followed by 3D then this would be 4cH;5cD and GF. You can not show 4cH; 5cD and inv+
- Pass 1NT
EDIT: following additional options:
- 2♠=♣ OR Invite with ♦
- 3♣=Weak or GF with ♦