The doubler held:
♠ AKxx
♥ xx
♦ Axxxx
♣ Qx
Six diamonds (trivially) and four spades (with careful play) both make.
If you double then I think partner will probably pass. If he leads a trump then you make +300, otherwise +100 if he leads a spade and switches to a trump, or worse if he does something else.

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