DUMMY'S RESPONSIBILITIES
You may not call declarer's attention to anything except that he is about to lead from the wrong hand or to ask if he is out of the suit being played.
As dummy you may not play or touch any card in dummy (even a singleton) until declarer calls the card. If declarer designates a suit, but not the rank, he is deemed to have called for the lowest card of the suit indicated. If declarer designates a rank but not a suit, he is deemed to be continuing the suit in which dummy won the last trick.
Otherwise, be silent during the play. Dummy is not allowed to call the Director.
PRINCIPLE OF FULL DISCLOSURE
The philosophy of active ethics tells us that winners should be determined solely by skill, flair and normal playing luck. Actively ethical partnerships take pains to ensure their opponents are fully informed. A major tenet of active bridge ethics is the principle of full disclosure. This means all inforrmation available to your partnership must be made available to your opponents.
Let's take a look at “weak two” bids from the point of view of full disclosure. When an established partnership opens a weak two bid, they have a great deal of information of which their opponents are not aware. The convention card discloses the point range, but little else. However, the partners are aware of the range of hands on which the bid can be made (discipline? suit quality requirements? five-or-seven card suits allowed? side four-card major ok? void ok? positional variations? Etc.). Full disclosure requires that all these inferences, restrictions and tendencies be made known to any opponent who inquires about their style.
If you are interested in knowing these things about your opponent's bid, merely say to the bidder's partner, "Would you tell me more about your style?" You may use the style inquiry to ask about any bid your opponent makes.
The actively ethical player will often go beyond what is technically required in volunteering information to the opponents. Quite often, the declaring side in an actively ethical partnership will volunteer such information before the opening lead is made. (But remember, when there has been misinformation given, such as a failure to alert or a mistaken alert, there is a LEGAL obligation on the player whose partner misinformed the opponents. He, the bidder, must give the opponents the correct information at the end of the auction if his side is the declaring side or at the end of the play if his side is defending.)
New players or infrequent partnerships usually will not have understandings about the items discussed here and, of course, it will be perfectly proper for them to reply "We have no agreement as to style."
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