Vampyr, on 2015-February-05, 20:54, said:
Sorry. I don't know how to insert comments in the diagram or to include an insufficient bid.
1NT = 12-14
3♠ = wide-ranging; shows a good suit.
? = South bids 3♥.
South tootles off with the director and changes his call to 4♥.
I'm not sure why that was necessary. Reading out the three possibilities should be sufficient in this instance for South to decide what to do if West declines to accept 3♥.
Vampyr, on 2015-February-05, 20:54, said:
It turns out that N/S's agreement is that 1NT-3♥ is weak with 6+ ♥, and this was what South intended to do, after not noticing the 3♠ bid. Should it have occurred to E/W to look at the CC or ask about 3♥, usually played as natural and GF, or at least invitational? Are they not entitled to the knowledge of what the bid probably means, even though North has that knowledge?
They have the entitlement to know what 1NT - 3♥ means in an uncontested auction and what 1NT - (2♠) - 3♥ means: all they have to do is ask.
Vampyr, on 2015-February-05, 20:54, said:
Why would 27D be applied? They haven't reached a contract they couldn't have reached without making an insufficient bid. Presumably since South has chosen to bid 4♥ now rather than Pass, that's what he would have done if he had realised at the time that this is what was needed to make a sufficient bid in hearts.
Vampyr, on 2015-February-05, 20:54, said:
I'm not sure I even understand this bit.
It does seem to me that in your scenario the thing that damages EW is having an unusual and wide-ranging agreement that has made it hard for advancer to know what to do. In those circumstances I would have thought it would be all the more important to ask what are their opponents' agreements.