2NT was systemically diamonds, but not alerted.
There was considerable discussion among the TDs at my local club last night in a multiple teams. South forgot that NS had agreed to play four transfers over 1NT. He asked about East's first double, and it was stated to be undiscussed, but by analogy with a double of a strong no-trump it might be majors/minors/diamonds, but West was sure it had not been discussed (off topic, what should it be if 2NT is natural and if 2NT is diamonds?). North decided to pass 3NT to try to pull the wool over East's eyes, and when it came round to him he pulled to 4D, and then sacced at the five level, arguing that South's undiscussed sequence made passing 4S not an LA, and that 5D was the only LA that was not demonstrably suggested.
East, the club's equivalent of the Secretary Bird, argued that North could not pull 3NTx, and that this sequence was mentioned on page 43 of the standard textbook, Burn's Book of Barking Bidding, where 3NT should show something like JTxx Ax AJxx Axx, and that North should therefore pass 3NTx because he has UI. East-West were unhappy as the other room gave in to 4S, and 5D made in some comfort. How do you rule?
2NT was systemically diamonds, but not alerted.
There was considerable discussion among the TDs at my local club last night in a multiple teams. South forgot that NS had agreed to play four transfers over 1NT. He asked about East's first double, and it was stated to be undiscussed, but by analogy with a double of a strong no-trump it might be majors/minors/diamonds, but West was sure it had not been discussed (off topic, what should it be if 2NT is natural and if 2NT is diamonds?). North decided to pass 3NT to try to pull the wool over East's eyes, and when it came round to him he pulled to 4D, and then sacced at the five level, arguing that South's undiscussed sequence made passing 4S not an LA, and that 5D was the only LA that was not demonstrably suggested.
East, the club's equivalent of the Secretary Bird, argued that North could not pull 3NTx, and that this sequence was mentioned on page 43 of the standard textbook, Burn's Book of Barking Bidding, where 3NT should show something like JTxx Ax AJxx Axx, and that North should therefore pass 3NTx because he has UI. East-West were unhappy as the other room gave in to 4S, and 5D made in some comfort. How do you rule?
My tuppence worth:
If 2N is a transfer to ♦ then, IMO, then 3N is the correct response on the South Hand: Too good a fit, merely to break to 3♣ but no major control to show; so 5♦ by North does seem automatic; but after this surprizing development., it is hard to believe that iSouth would not waken up to the recent agreement. Hence, prior to the lead, he should confess all.