1) It is in the site rules of BBO, you have to announce your system. So everyone not playing some kind of BBO Basic should announce his system. But I won't give a penalty for that.
2) The explanation was: "weak, 2 5 cards" which is correct (and much more clear with the ","). But you could argue, that a
complete disclosure must be better. If you accept the explanation as correct, EW have no right to an adjustment.
3) You decide to rule "incompleat disclosure" or "misexplanation".
East bid 4
♥ thinking that 2
♦ was a weak2 with 5+
♦.
In that case you have to decide, if most players of about the same skill would bid 4
♥ with the east Hand. If you don't think that "everybody" will make that bid, the action qualifies as "gambling".
Code of practice, on ,, said:
Score adjustment
The award of an assigned adjusted score (see Law 12C2) is appropriate when a violation of law causes damage to an innocent side (although the extent of redress to this side may be affected, see below, if it has contributed to its own damage by irrational, wild or gambling, action subsequent to the infraction). Damage exists when, in consequence of the infraction, an innocent side obtains a table result less favourable than would have been the expectation in the instant prior to the infraction.
"The Code of practice" is as importend as the bridge laws themselfs.
So you should ask east, why he bid 4
♥, and what 2
♥ or 3
♥ would have promised. Bidding game on his own hand with 17 HCP (with Q
♦ probably worthless) and only 6 cards in
♥, east might have
dug his own grave here.
The AVE scores are artificial scores and should only be assigned, if there is no way to get a "played" result. So in f2f bridge they yould be no option here. In f2f bridge you would have to assign as "split score" beeing a different result for EW and NS. This is not available at BBO.
So if i decide misexplanation and gambling, i would assign AVE- to both sides.
If you decide just misexplanation, you'll have to give NS AVE- and NS AVE+.
If there is no misexplanation, there is no case.