| Dummy cannot draw attention to an irregularity (e.g. a revoke or lead out of turn) by a defender in the middle of play. |
Dummy may not call attention to an irregularity during play. (LAWS 43.A.1.b)
But
Dummy may draw attention to any irregularity after play of the hand is concluded. (LAWS 42.B.3)
And
Dummy may try to prevent any irregularity by declarer. (LAWS 42.B.2)
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| Any player can draw attention to an insufficient bid, but the next player to bid can choose to accept it. |
A bid that fails to supersede the last preceding is an insufficient bid. (LAWS 18.D) For example, North opens 1♠ and East then bids 1♥.
Unless prohibited by Law, any player may draw attention to an irregularity during the auction period, whether or not it is his turn to call. (LAWS 9.A.1)
Any insufficient bid may be accepted (treated as legal) at the option of the offender's left-hand opponent. It is accepted if that player calls. (LAWS 27.A.1)
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