This hand came up on the first night of the Victorian State Teams Championships ("the Pennant") in the qualifying phase.
West is a multiple state open team representative and quite a good player. West is also good friends with both North and South.
Stop cards are not in use in Australia and bids above 3NT are not alerted. The 8-10 1NT range was pre-alerted in addition to being alerted by North when it came up.
Nobody asked about the 4♦ bid; which was somewhat fortunate for North-South as without the intervention 4♦ would've been RKCB but they hadn't explicitly discussed whether that was off after intervention but it seems they were on the same wavelength.
There was a noticable hesitation by East after the 4♦ bid and he apologised and acknowledged the break in tempo as he was putting dummy down.
After winning the ♠ lead in hand and playing a ♥ to the K, declarer got trumps wrong and then claimed 10 tricks conceding a ♣ and a ♦ after which South made a tentative suggestion that he might like to have the TD look at the board, to which West represented that he had a clear 4♥ bid at teams with a mini-NT on his right and a preempt on his left. North quickly agreed with West and the board was scored-up without any involvement of the TD.
If the TD had been called to adjudicate on the board, how do you think he should've ruled?