the bidding was as per the diagram. 2NT was 17-18 apparently. At the key point, north bid 3 hearts after a great deal of agonising. it felt clear to me that he had half the deck, but obv what's clear to me and what's clear to other people are not one and the same thing. anyway, south raised to 4♥ and north keycarded before bidding 6 and slotting in 1430. as south was putting the dummy down he said '3H was technically non-forcing' but he bid 4 anyway because he had good controls.
you may think that's an absurd agreement, but that's by the by.
i felt that the difference between a technically non-forcing bid and a non-forcing bid was when one's partner gives you enough UI to let you know he doesn't want it to be passed, so i called the director.
The director commented that north's pause didn't suggest anything as he may have been contemplating a weaker action. Obviously he may be considering pass, but i would think the decision whether to play in one's 6 card suit or not when partner has shown a balanced hand would be quite swift. he also said that the table feel from my viewpoint that LHO had a strong hand may have been influenced by my bad hand (i had 2 kings which doesn't seem like an unusually weak hand when RHO has shown 17-18).
Anyway, eventually the director said he polled some players and all bid on, albeit mostly 3NT so he was letting the score stand. I can't recall responder's hand to comment whether they would get to slam after 3NT, but let's assume they would.
i couldn't understand why it's so clear to bid on over 3 hearts assuming that was one's system - partner has shown a sub-minimum response with 6 hearts. yes you have 3 aces, but you've only got 2 hearts. i wonder if people when polled are very good at putting themselves in the position of playing unusual/absurd methods whereby 3H is a weak call.
north thought 3 hearts was forcing btw.