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Doesn't the headline suggest that partner is stupid? Why else name it "Important lead"? If she has a trump trick, it doesn't matter what you lead. I strongly suspect that she has an ace and that it is not the ace of diamonds.
When you're given it as a lead problem in the BBO forum you are absolutely right: you know it's going to make if you lead the wrong thing, so a diamond can't be right, and we are back to our arguments about why a heart is better than a spade.
But at the table, you don't know it's a risk of making: all you know is that partner doubled 7C and then doubled 7NT. For all we know a diamond lead is going to generate an enormous penalty while anything else is one off. Partner should have something like QJ10 J1098 Jx J1098 for this double and declarer's going to have to duck the diamond lead at trick one to get out for 2 off.

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