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The purpose of the Laws remains unchanged. They are designed to define correct procedure and to provide an adequate remedy for when something goes wrong. They are designed not to punish irregularities but rather to rectify situations where non-offenders may otherwise be damaged. -- Introduction to the Laws
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The objective of score adjustment is to redress damage to a non-offending side and to take away any advantage gained by an offending side through its infraction. Damage exists when, because of an infraction, an innocent side obtains a table result less favorable than would have been the expectation had the infraction not occurred. -- Law 12B1
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1.(a) When after an irregularity the Director is empowered by these laws to adjust a score and is able to award an assigned adjusted score, he does so. Such a score replaces the score obtained in play.
(b) The Director in awarding an assigned adjusted score should seek to recover as nearly as possible the probable outcome of the board had the infraction not occurred.
-- Law 12C
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1. (a) Until the end of the auction period (see Law 17D) and provided that his partner has not subsequently called, a player may change a call without other rectification for his side when the Director judges that the decision to make the call could well have been influenced by misinformation given to the player by an opponent. Failure to alert promptly where an alert is required by the Regulating Authority is deemed misinformation.
(b) The Director is to presume Mistaken Explanation rather than Mistaken Call in the absence of evidence to the contrary.
2. When a player elects to change a call because of misinformation (as in 1 preceding), his LHO may then in turn change any subsequent call he may have made, but Law 16C applies.
3. When it is too late to change a call and the Director judges that the offending side gained an advantage from the irregularity, he awards an adjusted score.
-- Law 21B
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2.(a) The Regulating Authority:
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(iii.) may prescribe alerting procedures and/ or other methods of disclosure of a partnership’s methods.
-- Law 40B
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An Announcement is a word or a short phrase that describes the meaning of partner’s call. Announcements are a form of Alerting, and you must still visually Alert the call. Calls that require Announcements must be immediately announced, even if the call would otherwise not be Alerted or if the Alert would be delayed. Announce the following Agreements:
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4. After a 1-level major suit Opening in first or second seat, a 1NT response that is Forcing or Semi-Forcing. Also announce “could have 4 spades” in the unopposed auction 1H - 1NT if you routinely bypass a 4-card spade suit.
-- ACBL Alert Regulations, Announcements
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Infraction: A player’s breach of Law or of Lawful regulation.
Irregularity: A deviation from correct procedure inclusive of, but not limited to, those which involve an infraction by a player.
-- Laws, Chapter 1, Definitions
1. It seems like it would be difficult to misunderstand "Was 1NT forcing?" Not that it matters to the ruling.
2. The question was asked and answered after dummy came down. We are now in the play period. This matters (see below).
3. Jillybean told the Director that had she known that 1NT was forcing, she would have bid 3
♥ over 2
♠. The advisability of doing so is not relevant to the ruling, only the possible outcome(s) are relevant.
4. Failure to announce 1NT forcing is an infraction of the Alert Regulation and hence of Law 40B. (See the definitions above).
5. Such infraction is considered MI "absent evidence to the contrary" (Law 21B)
6. It is too late for Jillybean to change her last pass, since we're now in the play period (see #2 above).
7. If the TD judges that the offending side (OS) gained an advantage from the irregularity, he awards an adjusted score. (Law 21B3).
It seems to me that the OS *did* gain an advantage from their infraction/irregularity, because if Jillybean had been able to bid 3
♥ over 2
♠, the OS would have had to decide whether to allow that contract to stand, double it, or bid 3
♠. Since they didn't need to make that decision, they gained an advantage.
The TD, called at the time dummy went down, should find out what the OS might have done over 3
♥ and instruct the table to play out the hand, and to notify him of the table result. Now he may adjust the score to whatever would have happened in 3
♥, or in 3
♥ doubled, or in 3
♠ (there may be other possibilities). He may award a weighted score.
What if there was no damage, if none of the possible results would have given the non-OS a better score than they got at the table? In that case it seems to me there should be no adjustment, even though Law 21B3 doesn't refer to "damage" but only to "advantage". There is another consideration though: if this was Matchpoints (the OP doesn't say) then it's possible there was (or wasn't) damage to the Matchpoint (MP) score. If there was damage to the MP score, adjust. If there was no damage because the Non-OS would have obtained the same MP score they got at the table, one might adjust as a message to the OS to remember to announce 1NT Forcing. Some will see that as silly. I suppose TD could just tell them.
The details of any score adjustment depend on the four hands, and we don't have those.
I would not give the OS a procedural penalty unless they've made a habit of this infraction and have been warned about it before.