Nothing against takeout doubles, but please note that "double with a double-negative, pass is forcing, opener's double shows a balanced hand" is straight from BWS 2017. JoAnn and Danny are playing the presumed expert consensus approach, but now they're in the wilderness without a map.
Seems like Rubinsohl is a workable mousetrap here if you already play it over 1NT interference
2N, 3C, 3D, 3H are transfers
the transfer to (spades) is Stayman
-- if no 4-card major, bid 3NT with stopper, else scramble
3S asks for stopper, denies 4-card major; bid 3NT or scramble
A question for those who chose Pass: is that because you are treating double as a support double, or just being cautious, or is there another line of thinking? I'd appreciate a bit of patient instruction, thanks.
Bidding 4♦ now -- a minority opinion, to be sure -- because I see no point in waiting until after 3♠. Partner's round suit cards are working for me. I hope partner will raise with Ax, or do the right thing (double?) if the opponents try 4♠.
Seems like 3♣ wins only if partner has the 5♥ hand, but MSS has a much larger target possibility in partner's hand (4 or 5 cards in either of two suits). At IMPs I'll go with what is more likely to find a fit, and a ...