(1) S asked the meaning of 2♦ (given as "natural, weak") before bidding 2NT
This one is from a club MP tournament last night. Weakish field. E/W are a young inexperienced pair. They play a modified Michaels where 2♦ over 1♣ shows the majors (2♣ being natural), but E (the most inexperienced of the two players) forgot the system and took 2♦ as natural, preemptive.
TD was called by S at the end of the play. The table result was 1 down in 3NT. S claimed that he wouldn't have bid 2NT with the singleton ♥7 if given the correct explanation.
Your ruling?