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Question about Bridge World Standard control bidding

Consider an auction like 1-3; 3-4. In BWS 17, that's a limit raise, length in spades with slam interest, and then a diamond control. 4 isn't Last Train because two below-game control bids were available. But what can we infer about responder's controls in the minors -- first round in diamonds, may or may not have second round club control? No control in clubs, first or second in diamonds? High card versus short suit?

From the Bridge World Standard 2017 summary, I can't tell what the control bidding style is: the problem is that the summary essentially gives variations from "Standard American" rather than spelling out a complete system from scratch. So, everyone knows that after we've agree on a major suit, a new suit above three of the major is a slam try; you won't find that spelled out anywhere in the BWS 17 summary! It does, however, say that the first slam try shows length, if the bidder has only shown one suit, and describes when Last Train, Mild and Serious slam tries apply, all modifications of previous standard practices.

Question for those who follow the Master's Solver's club -- does the panel tend to control-bid "Italian style" (any first or second round control, cheapest first) or do they still tend to bid first round controls first? Or other? If at all possible, please cite a specific MSC problem to support your claim. Thanks!

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