[1eyedjack]

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MP, best hand South, pro Gib 30

OK, 2D may be questionable. But it still only promises 3 card Clubs.

If North is not worth 2N on this hand, when will it bid 2N?

[Bbradley62]

1eyedjack, on 2014-October-02, 13:02, said:

If North is not worth 2N on this hand, when will it bid 2N?

Do you mean over 1♣ or over 2♦?

[iandayre]

A familiar theme. 3C zero out of 10, why GIB refuses to bid NT I can't imagine. What was the rationale for 2D? 2NT seems obvious.

[1eyedjack]

iandayre, on 2014-October-02, 14:48, said:

What was the rationale for 2D? 2NT seems obvious.

Yes 2N rebid is probably right on this hand.

Opener's 2N rebid (after inverted minor raise or after 1D-2C) is a weak part of GIB, being a wide range of strengths opposite a potentially invitational hand which invariably passes 2N when the initial minor raise was based on less than GF. I have trained myself never to rebid 2N, although when I remember I can do so with a minimum opener that would not itself accept any game try. I forgot on this occasion, but probably South should reject any game try.

The explanation of 2D is a little weird. It does not expressly name the minimum Diamond length but "new suit" may indicate an expectation of 4+. In that case GIB might reasonably expect me also to have 4+ Clubs (maybe even 5+) else 1D would have been the systemic opener. I wonder whether a 2M rebid also would promise 4, although in that case 3+ Clubs would still be possible.

I only chose 2D as a bit of an experiment, to see if it would affect the opening lead v NT.

[uva72uva72]

In my view, BBO has uninvented the wheel when it comes to inverted minor raises. 3♣ at responder's second turn should show 5+♣s (who plays 4-3 minor suit fits at the 3 level?) and an invitational hand - a hand that would have jumped to 3♣ initially playing limit minor raises.

If North evaluates its hand as invitational, it should probably bid 2NT initially - in game or partial, NT is probably the place to play, and South can pull to 3♣ with a weak unbalanced hand. If North evaluates the hand as a game force, 2♣ initially is okay, but its next bid needs to be 3NT. 2♣ followed by 3♣ is 0 because, as here, it can get you too high and into the wrong spot.