So the general setup is as follows. Left hand opponent opens the bidding with 1 NT (strong, balanced, 15-17 HCP), partner doubles (for penalty, promising 16+ HCP), right hand opponent passes. Which kind of hands should make any non pass bid now?
Note that at least 31 HCP are already accounted for, so own hands is guaranteed to be fairly low in HCP and partner didn’t provide any information about shape or suit preferences.
Background, I recently played a hand on bridgebase where I did the doubling and my robot partner bid 2 hearts. I was fairly clueless what I should expect from partner there.