Posted 2021-November-01, 10:12
First, you don't have to worry about the Laws - that's what the Director is for. Of course, if you want to disagree with the Director's ruling, it's helpful to know what you're arguing against.
Here, however, it's easy (though one of the first skills needed to learn when Law-reading is what isn't relevant. Like 90% of Law 12, in this case).
L74C6 (and 8), or potentially 68B1 ("abandon[ing] their hand") leading to L82B1 and 12. Due to the nature of the event (BBO), certain things are not possible. I am surprised it was one of your opponents that left - hopefully it was a internet hiccup and not having a stroke at the keyboard (yes, that happened to a friend of mine). I would much more expect the opponent.
Having said that, ignoring the "out of hand" issues (like the PP that can't be assigned online, or the lack of weighted scores), we have to assign a score. An artificial score is clearly a windfall for declarer (because there's no way they're getting 60% on this board even if people who only play hearts fill in to finish the hand), and anyway shouldn't happen - a result can be obtained (12C2a), so we do it.
It seems obvious that South has the ♣K, or West wouldn't have ducked twice and Ace. So let the first diamond go, and then either the next diamond or the heart finesse leads to two tricks in already, ♦A and a ruff, three spades and two clubs, and Declarer gets the ♦K and two hearts. That does in fact seem "automatic". If polling shows me that someone that doesn't care about the hand would lead a fourth trump, I would give some fraction of -2 (giving the benefit of doubt to the non-offenders). But of course, BBO won't let me weight scores, so I'm stuck with -2 or -3.
My feeling is that it should be obvious who has the ♣K. Definitely if your partner had abandoned the hand (which I assumed the first time), -3 is "automatic". I could be convinced -2 is right, especially if North quit for a no-excuse reason. I would be surprised if 3NT is bid and made very often here (if bid, my guess is that it makes a reasonable amount of time - it shouldn't, but it's hard to pitch well to not get end-played or give away a trick. But still). So the difference in score between -500 and -800 is pretty minor.
So, yeah, determine the infraction, 12A1, 12B1a, b, and c, and potentially 90A, depending on what the reason for the noplay was.
But I bet it was "temporary internet issues", and all this "how dare they do this to *me*?" is exactly that. I'd be much more suspicious if it was declarer potentially "ragequit"ing.
How much of this should a player need to be able to do? None. Call the TD and get an adjustment. If they don't agree with the adjustment, make the case - the question is fine at first, and the answer ("automatic") seems brusque, but correct. If they disagree with the answer, now it's time to use their (bridge, not Law) skills to argue about how automatic it really wasn't. But then, they have to actually state a case.
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)