[HV added later, the play may not be 100% correct but has the key elements]
N KJT62.542.42.965
E:A43.T9.T96.AJ843
S:87.KJ73.KQJ73.T7
W:Q95.AQ86.A85.KQ2
Vul. EW, dealer N. The auction went 2D-p-p-X-p-p-p. Screens were in use. N alerted E and explain "mini multi". S did not alert W. After the opening lead W call the TD and indicated (seeing 5 diamonds from S) that something is wrong. The TD told us to continue to play.
The lead was D (to A), CK, CQ followed by a neutral lead. S from dummy, Q, K and A. H was not lead and as a consequence, 2Dx= was the table result for 180.
After the game, TD was called back. The following ruling was made:
1. There was clear MI. S should have alerted W that it is not a weak2 but mini multi.
2. 3N+2 was the adjusted score.
3. Then TD argued that the defense in 2Dx was not optimal, the contract should go down. This is a SEOWG so 12C1b applies. The difference between +180 (2Dx=) and -100 (2Dx-1) is self inflicted so 7IMP-s are subtracted from the NOS score.
The result for other tables was 3N mostly, with results split evenly between +1, +2 and +3.
This is Hungary, which has the 2007 rules without modifications.
The main issue: W assumed that 2D is natural (no alert). Thus, I (I was west) tried a takeout double to find a H fit or to play NT. EW has an agreed defense for multi: 2H and 2S is a takeout with shortness in the suit bid, 2N is a 1N opening with stoppers, X shows diamond holding. E interpreted the X as W having Ds. It is important to note the X is typically a not very strong hand, i.e. normally not above opening strength. It has a "partner, I have minors, they have the upper hand, leave them alone" meaning. This can be made with weak hands as it is rare that the opponents can play D.
E opened with D as he assumed that opponents are playing my suit. By the time he was to lead again, he saw SQ, DA, CK and CQ from me. 11HCP. The bid (showing diamonds and weak to opening strength) ruled out AQ in H (17 HCP). Thus, he tried (I think) C so I can ruff. As he marked me with trumps and not too much strength, he misunderstood the KQ play from me. He also misunderstood the SQ signal. Our signaling depends on the situation. He simply read it as attitude (thus, he was not afraid to play the A) while it was suit preference asking for H...
Now the questions:
1. Is this SEOWG? In my opinion it is neither serious nor unrelated to the infraction.
2. If you assume for a moment that it is: Is this calculation correct? Can you rule that contract B is assigned but mistakes in contract A are calculated?
3. Looking at the hand, 3N+2 is automatic for a S lead (happened at all tables but one) as there are 2S, 3H, 1D and 5C tricks. Making a mistake in defense is easy (this is the lowest division of the national championship, where absolute beginners play). Thus, I would think about weighting the +3. The TD ruling on this was that +2 is the double dummy score and +3 is a defense error so NOS is not entitled to it.
4. As the play ended with a claim, it was not discovered: N opened 2D mini-multi with a five card suit. This is brown sticker (weak opening, not indication a minimum 4 suit and not a "weak two in either major with possible strong options"). If this was not discovered during the event but only during the appeal (in progress), what are the options for the TD? Yellow and Red systems and Brown conventions are banned in this event.
5. A more generic question: How should banned treatments be dealt with? How do you handle this in other countries? I tried this once and I got as far as the opponents got a 1VP penalty for not having a CC during the second time we had to play (in the playoffs).