[diana_eva]

To make up for lamford's expert play problem

Here's a simpler one - make 3NT. (from my pro bono teacher, and alas I failed this one too, but had a duh! moment when I saw the solution)

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IMPs. Lead is ♠K

Spoiler

If you hold up spades they split 4-3

[Antrax]

Nice one. I think I have the main variant but what happens if

Spoiler

The defense ducks the ♣Q?

[edit]
Okay, I think I really have it now.

Spoiler

Win the third spade, play ♣Q immediately. If the defense wins they can cash one more spade and you make 4 clubs, 3 diamonds and two major aces.
So they duck the Q. Now you just start playing hearts making 2 clubs, 3 hearts, 3 diamonds and 1 spade ace

[helene_t]

I think the best chance is to hold up spades twice and then play ♣Q. This is a textbook example of a Morton's fork: Whoever holds ♣K has the choice between setting up the clubs for me, or letting me steal a club trick before I set up the hearts.

I am down if W started with five spades and ♣K but I don't think I can do better than that. W might have overcalled nonvulnerable if holding KQxxx of spades so the chances are reasonable.