[nige1]

Over 1♦, I rank
1. 2♠ = Weak
2. Pass = Reveal a minimum of information.
3. 2♦ = Michaels. but, with 6 HCP, at this vulnerability, after your partner has passed, an opponent is likely to declare the final contract -- and knowledge of your shape, will help him in the play.
Over 3N, I rank
1. Double = Penalty. You can bid 4♥ when opponents run.
2. 4♣ = ART. Good ♥ raise.
3. 4♥ = Expecting to make game.

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[Jinksy]

 Cyberyeti, on 2016-January-25, 06:02, said:

He leads from his K10xxxx hoping you have Qx(x) and hoping his card in your suit is an entry, blowing a trick, declarer then knocks out your entry

Why doesn't the 4th bidder just have AKQ8752 and his P a takeout double while we're at it? Obviously there are risks associated with a 2♠ bid, and P having a second source of tricks with a second outside entry that he's not sure whether to lead hardly seems foremost among them*. Clearly I think the risks of preempting outweigh the rewards.

Even if they didn't, Michaels is a terrible bid with all sorts of downsides (many but not all of which I've described), and I rate pass much higher than 2♦, no matter what your nominal range for it is. Do you really want me to give you specific holdings where bidding it here goes badly? How long have you got?

* On the hand you give, I'd prefer to just lead partner's suit than try my luck leading away from a broken 6-card holding with a highly dubious entry outside, assuming we're trying to set 3N. And (channelling Gwnn) I realise that means we'll occasionally fail to set the contract when P does have Qx of my suit, JTxxx(x) of his own, and the opps have exactly 8 tricks off the top, before you re-explain that to me like this is the first time I've seen a bridge hand.

[Zelandakh]

 Charlie Yu, on 2016-January-25, 05:12, said:

Why would that be too weak for michaels, I thought ppl play Michaels as 0-8 or 16+?

I think more common for split-range Michaels is for the lower range to be ~6-11 but the truth is that all-range Michaels is generally more popular on BBF and has been championed by Justin here. A corrollary to that is that the bottom end typically gets raised when red. Indeed, even some split-rangers only play it that way NV and revert to a continuous range V. Each method has its advantages and disadvantages with knock-on effects elsewhere in the system to be felt.

[Jinksy]

One of the big advantages of split-range Michaels is that everyone plays it anyway ('I'll figure out later whether this 12-count is an upgrade to 15 or a downgrade to 10...')

[quiddity]

Michaels looks fine to me, 4♥ by South looks fine too.