My solitaire bridge app dealt this one today. You are South declaring 6NT after an auction best not discussed.
North
♠ J42
♥ J83
♦ KQJ54
♣ J7
South
♠ AK10975
♥ AK
♦ A
♣ AK108
West leads the ♥4 and East follows with the 2. What is your plan?
The ♠A fetches the 8 from West and the 3 from East.
Do you see that you can cash the ♦A and then table the ♠10 to guarantee the contract?