A common problem seems to be where relayer wants to try for slam, but has a holding like xxx or QJx in a suit where partner has shown two or three cards. Unfortunately, the bids which ask about this particular suit would usually take you past the 4-level. So you can end up playing in 5 of a major with a side suit of Qxx opposite xxx. Is it playable to have methods which specifically ask opener to sign off unless he has a control in a particular suit? Or, is there a better way of dealing with this problem?
I'm using specific bids to set suits as trumps, e.g. 4♣ might show a slam try in hearts. How should these be played? Should opener be required to give key-card responses immediately, or should he have a way of indicating whether his hand is generally suitable for slam? (Note: relayer would already know at this point whether opener is minimum or maximum, but nothing more precise about the strength.)
After a suit is set as trumps, we can ask about opener's holding in other suits. Should these asking bids confirm that all the key-cards are present? If not, is the ace one of the cards which we are asking about here?
Opener usually shows 6M-3-2-2 shape by bidding 3♠. Assume for the moment that by choosing a relay sequence, responder is promising at least a doubleton in partner's major. Given this, what should responder's 3NT bid mean?
(i) Absolutely to play.
(ii) Choice of games. (How does opener decide?)
(iii) Some sort of slam try.

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