[lamford]

bluejak, on Dec 20 2009, 08:03 PM, said:

How should I know without looking?

By previous knowledge of case law as to how from (http://www.blakjak.d...uk/acbl_alt.htm):

1. Conventions that are not exempted below and all highly unusual calls

is interpreted (and whether a raise to 3NT which shows a shortage in a major is highly unusual):

for which the link

"ACBL Alert Regulations"

on the first page does not work. Also you might know whether the stated regulations, dated 2002, are current.

[barmar]

gnasher, on Dec 20 2009, 05:09 AM, said:

In any case, I don't see what bridge logic has to do with it. Which ACBL regulation says "You should alert conventional bids, unless it is bridge logic that makes them conventional"?

But I'm saying that it's NOT conventional. 3NT is natural and to play, but there are inferences from not using some other sequence to arrive there.