[smerriman]

---

Something went very wrong with the descriptions here.

Firstly, Gib's 2♦ apparently denies 4 spades. The bid itself seems fine.

The main problem arises after Gib's 3♠. My 4♦ shows 17+ points. Yet there wasn't any alternative bid - the one I really wanted to make was a natural 4♠. Gib described that as.. a cuebid in spades.

Incidentally, somehow 5♦ by Gib then shows less points (12-13) than its previous bid (12-16).

[iandayre]

Agreed there is no reason that 2D should deny 4 Spades after the 2C interference. I suspect you would have done better to bid 2S - certainly natural and forcing - yourself next. If GIB doesn't support Spades after that, we have a bigger problem.

[lycier]

I think this is a Gib bidding system problem.

First step
With 2♣ interference, opener's rebid-2♦ should deny 3-card ♥ or 4-card ♥ support, and it shouldn't deny 4-card ♠. Here if opener wants to rebid 2♠, it is really a unreasonable bid because 2♠ should show " opener reverse -- 5+♦,4♠,2-♥,21-hcp,18-22TPs".
Here, no problem.

Second step
After 2♦, responder can't rebid 2♠ to force to game because 2♠ should show 5-card ♥ + 4-card ♠. So it is only way for south seat to rebid 3♣. Unfortunately opener's rebid 3♠ only shows 3-card♠. There is no way for Gib to find another major fit in such case.

Third
See 4♦ and 4♠, their explanations are absurb.

---

Even if responder really rebids 2♠, opener's 3♠ raise only shows 3 cards ♠.

---

[jdonn]

Yes obviously the problem is that normally a 2D rebid after 1D 1H denies four spades, but a change should be made to account for this auction where 1S is no longer available.