I am asking about situations where you open the bidding, there is an overcall from LHO and your partner bids at the 2 level. How does this affect whether opener's rebid is a reverse.
1. Suppose the bidding goes
Does the 3C rebid show any extra strength? I believe the answer is no, because your partner's response already was above the "barrier" - the 2 level of your opening bid.
2. How about
Here I believe the answer is YES, because partner's rebid was below the "barrier"
3. Finally, what about hands where you are balanced but without a stopper in the overcalled suit e.g.
C KQJ8 (16pts)
I believe that 2NT in this situation should show a spade stopper, so the only other alternative is 2S - a directional asking bid, asking for a spade stopper - as long as your partnership has this understanding. I think 3C should be avoided as it should show 5 hearts.