Trying for a heart slam seems ambitious to me but partner could have four clubs, could he not? If so, maybe 6♣? If you feel no slam is viable then strengthen the hand a bit. I am asking whether there is a plausible way to play in 6 of a black suit if we have a 4-4 fit and enough controls in either one, and sign off in 4♥ if partner has three hearts and no four card black suit.
Since I am asking more about systemic agreements than judgment, I will tell you that I passed four hearts, the lead was the king of diamonds and partner, with AJT9xx of diamonds, had no problem making 13 tricks for a mp top. Without the favorable lead, 12 tricks are there but I think it requires luck and double dummy play.
Partner doesn't have four clubs on this deal, but nothing in the auction so far says that he doesn't. I thought a bit about how t explore for this and gave it up. Any ideas? As I say, feel free to strengthen the hand a little if you think that with the given one any slam try is absurd. I am aware that some (not us) play 1NT-3♦ as shortness, but opener with a six card suit then does what?

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