[Codo]

pclayton, on Jun 7 2007, 12:49 AM, said:

1. What would a direct 4♦ show / deny versus the 3♠..3N...4♦ sequence?

2. What would 4♠ over 4♦ be by responder?

4 NT is not KC because: Responder has the weaker and in terms of HCPS better defined hand, so his pd should ask.
It is not KC because he must be able to show a hand with many quacks.
It is not KC because 1/2 of the posters here would take it different.

1. In my limit experience 4 Diamonds should always be RKCB for Diamonds which makes this sequence much easier. I would take a direct 4 Diamond bid as a much stronger ínvitation for the Slam- another reason why I guess that 4 NT should be a kind of sign off.

2. A Highcard in Spade, denying a Heart Honour on the way.

[Edmunte1]

4NT is RKCB for me, 3♠ was an advance cuebid or an asking bid. 4♦ now shows the strong hand. I guess 3♣ was showing extras too and 3♦ showing a semisolid 6 card suit or a 7 card suit. No way for a regresing 4nt here, 5♦ is the only brake.