NS are playing strong NT 5cM
The bidding goes 1C from north (2+ clubs as 1D would be 4+ unbalanced)
1NT from East
2D from south, the hand shown. North alerts, west asks and is told majors - for the benefit of the paranoid, there's no reaction from south to betray matters
Pass from west
North bids 2H then prior to East bidding corrects the explanation to natural
EW then silent
South bids 3C
North bids 3D ending the auction
Obviously south has UI that north doesn't have the heart-club hand he advertises with 2H. North obviously has no UI and can do what he likes so is free to revert to diamonds once he's realised the error of his ways.
So do you feel south acted properly by giving preference back to clubs then floating 3D or should he be taking north for something strong enough to warrant further action?
North-South are experts but not a regular partnership.
BTW west is never bidding so has no desire to change his call

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