Playing IMP pairs with a presumably competent, but unknown partner. Opponents are similarly unknown. RHO deals and opens 1 Heart. You overcall 2 Diamonds. LHO raises to 2 Hearts. Partner, not a passed hand, bids 2 Spades. Opener contests with 3 Hearts. Now what?
3 Spades is an option that was left off the menu. If you select that, check Other.

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1H-2D-2H-2S
3H-?