[fuburules3]

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IMPS.

The spots are approximate. You have played with this partner before, but you do not have much in the way of agreements other than you are playing a simple 2/1 card. If it matters, there was a bit of a tank between X and XX.

What do you think of 3♦ bid? Would you bid 3♠ instead? If so, under what conditions would you bid ♦ first? In some partnerships, I have a meta agreement to always show the major if you will only get to bid once, but this was not one of these partnerships.

How strong of a hand should X and then bidding 3NT show? Is south too weak for this action?

What should XX show in this auction? Is south right to leave this in?

[gartinmale]

If it matters (maybe it does based on likely general preempt strength?) I played this hand and E/W were vulnerable.

[FrancesHinden]

I think South's actions are fine, double-then-3NT shows a good hand but some doubt about playing in 3NT.
North's redouble should mean he wants to play there, unless you've agreed otherwise, so I hate it. I would bid 4C on the North hand with or without the double, I expect to play in 4S or 5D.

[mfa1010]

I would have responded 3♠. The difference in suit quality/length between ♦/♠ is not great enough to surpress the major, and I do have a few values, so it is ok if partner raises 3♠. After partner's 3NT I would have passed (given a 3♦ bid). His sequence is implying some hope for finding a major fit but we have little guarantee to find a spade fit and not just four hearts opposite. Redoubling for blood is not appreciating that partner is under a lot of pressure in these situations and should have some leeway.