aawk

To open or not to open will always a debate in bridge. The trend is to open with nearly any 11+ HCP even holding a nt pattern. Play for MP go right ahead and agree with your partner what your rebid with a 5332 pattern and a minimum should be. Play for imps i would pass first, no reason to reveale your hand yet because its not likely to be passed out. If partner opens you can get to game anyway If opponents open you can balance if needed The argument to open this hand so partner knows what to lead is a indication a lesson in what and how to lead is recommended. For example (IMP) you hold Kxxx Jx xxx xxx and opponets bid 1nt-3nt do you lead x from Kxxx in s or lead the J from Jx in h. Leading s is a passive lead and is not likely to gain the needed tricks to set 3nt. Leading h is looking for partners strenght and more likely to set 3nt.

If you play the 4th suit game forcing 2nt is a invite and does not garantee a c stopper that is the price you pay for it being game forcing. What to bid with the hands you gave us depends on the style of your partner openings bid, if it can be light bid 2nt if not bid the 4th suit.

A good rule in imp play is never play weak over weak. If you give a overcall of 2h or 4d (to show 5-5) gets you into trouble if west is strong. So just pass and see what will happen. If it goes 2d-p-2s-p// p-? you can bid 2nt to show a 5-5 outside s for take out weaker than introduced directly. After 2d-p-2nt-... ending in 4s you can bid 4nt to show your 5-5 (to decide if to bid 4nt take into account what kind of strenght east showed after the asking bid of west). If a bid of (2nt) 4nt can only show 5-5 in the two lowest suits this hand can only be bid with a lot of risk. So pass would be my advice and make a agreement with your p that (2nt) 4nt is takeout with any 5-5 in the given bid sequances.