I opened this 1S. I can systematically open it as a GF with majors, but didn't because I thought the heart suit sucked. This was perhaps unfortunate. The 3H was undiscussed but partner and I were both on the same page that it was a natural second suit and forcing to game.
Alternative options to 3D are: 4D splinter agreeing spades, 3H, 4C fitjumps, 2S competitive, 3S pre-emptive, 4S very pre-emptive and 2NT limit+
Question: It's your turn to bid in the diagram. This is where I committed the fatal mistake. Do you bid 5S here or do you pass? Going up in front of partner seems a bit bad.. but I do have a 6/5 two suiter with no defence. Though maybe 3H shows that?
Results: It turns out that 5H is one off and 5Dx'ed is going for 500 (for a game swing in as at the other table our team mates opened the south hand leading to the auction 1D-(2D)-5D and oppo guessed wrong).
As it turns out partner has 3/2 in the majors and 6(!) clubs, so maybe 3D wasn't the greatest bid ever there, but it doesn't affect the question.
vvvvv: Bidding replaced by diagram. 3C would be round forcing.

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