[sceptic]

Scoring: IMP

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West North East South

 1♣    Pass  1♠    Pass
 3♣    Pass  3NT   Pass
 4NT   Pass  Pass  Pass
 

[badderzboy]

Hi Wayne,

The consideration here is had you described your hand completely with 1♣ and 3♣ to partner?

Answer is yes so you need to trust partner who has been listening to you and said thanks 3NT is the limit of our hands.

So not keen on the 4NT as you had no more to show I'm afraid...

Steve

[temp3600]

After 1C - 3C in sayc, you cannot make another voluntary bid. You can only bid if partner asks you to describe another feature of your hand. So 4NT over 3NT is an impossible bid.
If you feel like you have something in reserve after 1C - 3C -- enough in reserve to actually make another bid -- then 1C - 3C (especially 3C) was likely an underbid.

Now to the actual hand. To me, this hand is too strong for 1C - 3C. Looking at this hand, before the auction starts, I'm thinking 1C - 2D - 3C. The 1S reply from partner slows me down slightly, but not enough to downgrade the hand to 1C - 3C.

[inquiry]

Others above have covered it, but let me try to rephrase this with reference also to your jacoby 2NT auction posted about the same time (where you had ♠KQ, ♥Kxxxx ♦Txx ♣Kxx). When you have defined your hand and your partner is undefined, your partner, not you, should be the "captain" of the auction. Here, your jump to 3♣ has described your distribution and stregnth. Your partner is now captain, not you. He bid 3NT and you need to respect his decision. He is the only one who has a clue as to the net assets your side hold, not you.

On the jacoby hand, you have defined a lower limit for your hand (with the 2NT bid) and your partner has made a slam try (with 4♣). Who is the captain? There it is not clear, but you know something your partner doesn't know, you are minimum for the auction. If your RHO had passed 4♣, what would you have bid? I suspect the answer would have been 4♥ to show minimum jacoby 2NT bid (mine would have been). There is no way with a minimum for your earlier bid you should assume control of the auction over 4♣ or over their 4♠ bid. I would have doubled with your hand on that one of their 4♠ bid suggesting time to stop, but I would not object to 5♥ bid either.