1NT[1] 2H Dbl[2] 4NT[3]
Pass 5H Dbl 6C
Dbl 6H Dbl All pass
Down 4, NS -800
[1] Announced, 12-16
[2] Alerted, explained as transfer
[3] Keycard for hearts
The actual EW agreement is that the first double was penalty.
This occurred in a team game played at home; although a director was available to give telephone rulings, he was not called, and the players solicited a ruling by email after the match (a procedure condoned by the Conditions of Contest).
All players are sound intermediate level. A poll of players of comparable level found nobody who would call 4NT whether they were given the correct or the incorrect explanation.
How would you rule?

Help
