Zelandakh, on 2014-May-22, 04:21, said:
It is not that clear in the reading. The instruction in the alert procedure refers to NT openings, and then notes examples of rebids in 1NT or 2NT after and artificial club opening which should be treated as defacto NT openings for the purpose of NOT alerting any form of Stayman.
It is not clear whether the examples are all-inclusive, or whether it applies to all such "Notrump sequences". There is a further hedge thrown in, saying it should be alerted if the club bid could be taken as natural (by an opponent) -- so now we are expected to guess which opponents might think it isn't Stayman???
In the ACBL, they probably didn't consider Multi 2D followed by a clarifying 2NT when giving the examples --since Multi itself is spurned. But, they should have thought about Carousel and made a pronouncement for that case.