Opening Bid: Two Hearts or Two Spades
The Weak Two Bids
A long time ago, when we first learned what a weak two bid was, we embraced the idea of opening with any weak hand so long as we held a 6-card suit, regardless of it's strength. Eventually we quit doing that because too many people were finding it profitable to double us. Most of us today will have at least one of the top three honors and are careful about the vulnerability.
The other thing about weak two bids is that we found that an opening bid of two diamonds simply gave too much information to the opponents about the size and shape of the hand without being very preemptive, so most players have quit using the bid, preferring to have that bid show a different hand. We have a better use for the bid of 2
We play the weak two bid in a major a little stronger than most players, but for a good reason! We have the agreement that a weak two will have 8-10 HCP with at least one of the top three honors. Now my partner can easily evaluate her hand opposite mine.
2NT For a Feature
This is a very old agreement, but still one of the best. It's simple, easy to remember, and effective. If responder is an unpassed hand the 2NT bid asks opener if he has an outside ace or king. Partner is trying to determine if she can play in a 3NT contract and if she will have an entry to the dummy after the long major is established.
However, if partner is a passed hand it is not likely that she iis bidding 2NT to try to reach a notrump contract. Most likely she is simply trying to determine if game in the major is possible. For that reason The opener should consider not only outside aces or kings in her rebid, but also voids and singletons. (Remember though, only consider voids if partner is a passed hand.)