Posted 2014-November-20, 11:35
As is true in all such cases, Announcements != agreements != full disclosure. Those that don't understand this have the obvious resulting problems (including the "I told you, it could be short" problem).
Playing a reasonably standard T-Walsh, for instance, 1♣ is Announced in the ACBL "could be short"; the agreement is "fairly standard T-Walsh" (which is 2 or 3 pages I'm not going to post here); full disclosure of the 1♣ bid is "11-21, clubs or any balanced outside NT range" (being prepared to explain what 1♦ opener shows if necessary).
If you agree Bergen Raises (which I would never do, for exactly Trinidad's reason in the other thread), then you have two paragraphs of agreements about the relevant calls and the relevant next round calls. If you agree Stayman - I hope you have agreements about not-Stayman and Stayman-and-bid. However, whether or not you play it 1940's Marx, 1960's Goren, EHAA Extended Stayman, whenever-they-learned-it "can't bid Stayman without a 4cM", or whatever, you *announce* (in the EBU) "Stayman". If asked for an explanation, of course, you give the correct full explanation (without explaining what opener is going to do, of course).
Announcements are just Alerts in a different cadence, which *usually* gives sufficient information to the opponents at least for now; and frequently are intended to take the overwhelmingly most common Alertable call out of "Alert", because everybody learns to ignore that, and then gets caught on the "real" Alerts.
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)