I don't have the answer to this non-problem. I call it a non-problem because pretty much all lines succeed in practice but I'm looking for the best answer in theory. N/S vul
♠ A K 10 X X
♥ A X X
♦ J 10 5
♣ J 7
♥ X X X
♦ A Q 6 4
♣ A K 6 4 3 2
You bid to 5♣ rather than 3NT -- well done, I think. Say 1♣-1♠-2♣-2♦ (art)-3♦ -3♥-4♣-5♣.
The defenders lead the queen of hearts; you win as East encourages and cash ♠ AK to pitch hearts -- nothing exciting happens.
The opponents will know you have no major-suit losers now.
When you lead ♦J would you expect East to cover from Kx? If the ♦ J holds what would you do next?
The opponents are more than capable of false-carding.
I'd be interested in knowing what you think the percentage play is, if the ♦J holds or if the ♦J is covered.
Plus... it's free!