[Fluffy]

what is going on? south has no defence and knows north has no defence, and has something close to 4414 so defends.

Why did partner double? that doesn't make sense, he should have ♣A as long as some diamonds given south's bidding, assuming that he thinks pass is forcing, but is pass forcing? south is an unpassed hand, nobody said we are attacking. I think partner is doubling because he has a trick and doesn't want us to defend or pass out.

There is another option: Partner has a very big heart stack, and north didn't understand the 6♥ bid as pass/correct.

I don't think the latter should happen, but I can't risk that north has hearts and we have a grand slam, So I bid on, bidding on to 6♠ or 7♦? I think 6♠ is plenty, partner will know to raise if he reads the auction properly, and he will with more diamonds than spades.

[niki98]

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This is what happened in the board. I will say my opinion:
6♦ looks OK to me. 6♥ isn't pass correct or something. My partner knows that I have ♥ or ♦ but since his RHO has bid 6♦ he knows I am with ♥ which also means to the opponent that my partner has honours in the two other suits. The X in my opinion means partner I have a trick which is most likely A♣, so 6♠ is reasonable.