Cyberyeti, on 2016-September-13, 18:37, said:
As far as W was concerned, he made a natural 2♣ bid, partner bid 3♥, whether this is fit or natural in analogous auctions in their system, I'd suggest W is going to bid again, and it's entirely possible the right bid is 3N, where N warned of the opposing 4-3 heart fit leads a pointy suit and lets it through, so I'd not be too fast to give an adjustment. (can the pp be 4♥ and 5♣ ?)
If 3♥ would be fit and not necessarily any great hand, it's possible 4♣ is the right bid.
I'm not sure 3♥ is alertable, so I'm not sure there is any MI, W has effectively psyched but there is UI.
I've had a further look at this - using the EBU white book.
1) If there is no LA to 4
♣ (no heart tolerance) then it is allowed. If not then 3NT seems the only possible LA
2) Playing in 3NT (possibly doubled) there is a chance North (who does not know but who may suspect the misbid) will lead a pointy suit as he is entryless.
3) If so we need to factor in probabilities and see if NS are damaged when we go through the weighted options. If not then the score stands.
4) East may be able to legitimately field the 4
♣ call if he can tell from his own hand (club void) and bidding (Partner pulls 3
♥) that partner has misbid. - in which case there is no adjustment.
5) If it is decided that East cannot field the 4
♣call then the contract will almost certainly be 4
♥ doubled as West will give up.
Edit: From the EBU White book - which helpfully notes
"It is not possible to provide guidance as to the strength of evidence required before a player may legitimately act on the basis that partner has misbid. Individual cases are rare, and can be judged on their merits."
No matter how well you know the laws, there is always something that you'll forget. That is why we have a book.
Get the facts. No matter what people say, get the facts from both sides BEFORE you make a ruling or leave the table.
Remember - just because a TD is called for one possible infraction, it does not mean that there are no others.
In a judgement case - always refer to other TDs and discuss the situation until they agree your decision is correct.
The hardest rulings are inevitably as a result of failure of being called at the correct time. ALWAYS penalize both sides if this happens.