Matchpoints. Lead 3♠ Table Result 4♦-1 (average).
This was the last-round of the Easter Congress and NS called the TD when dummy appeared. The TD asked for play to be completed, and at the end of play, as there was a lot of clearing up to do, it was agreed to give a ruling the next day.
The TD polled a number of people with the West hand, and all passed 3NT when given the hand without UI. However, the TD, consulting with others, decided that a slow 3NT did not demonstrably suggest that West pulled to 4D and he left the score unchanged. North was playing in a sponsored team the next day so was disinclined to get distracted with an appeal, but I am interested in your opinions on the TD decision.
If 3NT was passed, North stated he would probably have doubled.