The auction:
West North East South
- - - 1♦
Pass Pass 1NT* Pass
2♦** Pass 3NT Pass
Pass Pass
* Alerted and explained as 10-14 (this is the EW agreement)
** West thinks this is a transfer to hearts, East says afterwards that he thought it was a cue (asking for majors, INV or better). This bid was alerted, but both meanings are alertable in The Netherlands.
NS call the TD after the hand. They think that East may have used the UI that his partner understood his 1NT as 10-14 when he jumped to 3NT opposite a hand that could have 0 HCPs.
The TD comes to the table and decides that UI may have been used. EW appeal. East, an experienced player and a TD, says that he psyched 1NT, intending to play there, unless West did something. Now that West has cued 2♦, he was certainly worth a jump to 3NT. (West still thinks that they had agreed that 2♥ was a transfer.)
You are on the AC. What do you decide?
Rik
Edit: It may be good to know the table result: 3NT made after a diamond lead, followed by a small heart from hand by declarer for South's jack. Another diamond followed and another small heart for the ace. This gave East 9 tricks.

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