Jinksy, on 2014-April-29, 09:35, said:
Interesting. I was the criminal in question, and reasoned that since we had stuff like EKCB, Jacoby, splinters, possibly Josephine or other GF bids followed by 5♥ etc that it had to be preemptive. I also figured that since after 1♥ P, 2♥, 3♥, 4♥, 6♥ and 7♥ are all to play and (except 2♥) preemptive, 5♥ would naturally fit into the pattern.
Maybe how one answers your original question is partly a function of age. You seem to be arguing here that it would be sensible to play 5
♥ as natural and to play. That may be right. And it may mean that those who have learnt since all your other stuff became common haven't learnt any other use for the bid.
But your original question was how do you understand the bid if it is undiscussed. Although it doesn't come up very often, I think the "standard" meaning I would expect is the one suggested above of pass, bid 6
♥ or 7
♥ according to whether you have 0, 1 or 2 of
♥A and K. So my best guess would be that this is what partner has in mind. I would not be surprised to be proved wrong, though. (Similarly, if partner opens an undiscussed 4NT I expect him to be asking me to cue-bid an Ace if I have one, rather than asking me to give a B/W response, but I have no real way of knowing whether what he regards as standard is the same as what I regard as standard.)