This law has been reworded to cater for all methods of bidding.
Every player is entitled to know what has happened up to the time at which he must now make a call. Clearly, a player required to pass as part of a rectification has nothing to consider and therefore may not ask at that time.
With written bidding and bidding boxes the player looks again at the auction to date.
Although there is no "responder" with written bidding and bidding boxes the footnote suggests that each side is responsible for making sure their bids are not obscured eg a call from a bidding box slipping under a system card. Illegible calls could be handled via this law. Perhaps the careless circling of an alertable bid has made a previous pass look like a double. Rectification may be necessary via Law 12A1 and 12C1.
20C1 This question ought to be more than rhetorical. Asking, "Is it my lead" as the card is faced does nothing to reduce Law 54 rectifications.
20C2 Locally, "having calls restated" equates to looking at the written bidding or looking at the slips from the bidding box laid out on the table. The footnote confirms that declarer's usual "first turn to play" is from the dummy.
Dummy conceals the bidding slip when third hand has played to the first trick.
Some subjects handled in 1997 Law 75 have moved here.
20F1 has been improved to make it more difficult to evade giving full and complete explanations. "He is entitled to know about calls actually made, about relevant alternative calls available that were not made, and about relevant inferences from the choice of action where these are matters of partnership understanding."
If a player knows something about partner's call because of his greater knowledge and experience then the opponents are entitled to that information even if their bridge knowledge an experience is considerably less.
"The partner of a player who asks a question may not ask a supplementary question until his turn to call or play."
Suppose East asks a question at his turn and is given an explanation. If West wants to know more then he must wait until it is his turn to call before asking.
20F2 tidies up the grammar with, "At his turn to play from his hand or from dummy declarer may request an explanationů."
20F3 clarifies a previously grey area. The laws now clearly state that it is permitted to ask about specific calls. The mention of 16B1 warns players about the risk of conveying unauthorized information because of the problems partner may have when in receipt of that unauthorized information.
20F4 A player must call the director immediately he realizes there's a flaw in his own explanation. This includes alerting irregularities. The director may be able to rectify the matter to nullify potential damage.
20F5 Suppose a player thinks partner has given a wrong explanation, failed to alert or alerted when there was no systemic need to alert.
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