[A2003]

The Fredin Double
Revisited by Jos Jacobs

This is what happened here on Wednesday evening:
NS +1630.
There is a convention nowadays against this sort of auctions. A double after such wild bidding simply asks for a lead in the higher of the two relevant suits. So the combination of the double of 6NT, followed by a pass of 7 would neatly solve the E/W problem.

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Reference page 5
At 7 level run-out bid after 6nt, dbl shows lead ♠ and pass shows lead ♦, since ♥ and ♣ are shown by opponents.

What is the name of this convention?

[manudude03]

You don't need conventional doubles. If there is a chance that the opponents can run to a potentially making grand, don't double just because you're on lead with an AK.

[Zelandakh]

N and W both seem to have been replaced in the bidding by beginners. What would E-W have scored for 6NT-4?

[gwnn]

There was a very similar auction posted by I think jlall about 4 or 5 years ago and Helene proposed a very similar defence (X=lead something, pass=lead something else)

I am trying to find it but no joy yet.

I think it was

1N-p-2♣-p
2♦-p-6NT-p
p-X-p-p
7♣-x-p-p
p

1NT bidder had 6 clubs and 7♣x made.