[helene_t]

1c-2c
2h-2s
3c

In this auction, neither hand has established a gf. 2s was described as forcing to 3c. Yet 3c has a range of 11-21 hcp. The forcing character is not specified.
Could we have 11-13 nf,please?

[steve2005]

I am not sure of 11-13 is to specific.
The problem is there seems to be no diamond stopper.
So more should be possible, points as usual don't describe a hand.
But yes there are many sequences where Gib has narrowed down it's hand after 2 or 3 bids to 11-21.
The system at times is unworkable.

[pescetom]

helene_t, on 2018-September-27, 22:51, said:

1c-2c
2h-2s
3c

In this auction, neither hand has established a gf. 2s was described as forcing to 3c. Yet 3c has a range of 11-21 hcp. The forcing character is not specified.
Could we have 11-13 nf,please?

I don't play inverted minors, but for FWIW Larry Cohen does seem to consider that 1c-2c-2h-2s establishes a gf.
Unless by "next bid" he means any successive bid, not the immediately successive one.

[zhasbeen]

helene_t, on 2018-September-27, 22:51, said:

1c-2c
2h-2s
3c

In this auction, neither hand has established a gf. 2s was described as forcing to 3c. Yet 3c has a range of 11-21 hcp. The forcing character is not specified.
Could we have 11-13 nf,please?

Click on:
http://www.bridgebas...ystem_notes.php
Then select “Click here” link at top of page to see GIB convention card
See “Other” under Minor Openings where it says “2C after 1D opening not GF”

Although I hate to depend on the definition I would double check it with the example you gave. If you see no mention of GF after your 3C bid prepare to be left there. It can be a best guess on which game to pick if you don’t want to be left in a partial.

[pescetom]

zhasbeen, on 2018-October-02, 08:59, said:

Click on:
http://www.bridgebas...ystem_notes.php
Then select “Click here” link at top of page to see GIB convention card
See “Other” under Minor Openings where it says “2C after 1D opening not GF”

Although I hate to depend on the definition I would double check it with the example you gave. If you see no mention of GF after your 3C bid prepare to be left there. It can be a best guess on which game to pick if you don’t want to be left in a partial.

AFAICS the GIB CC just says that 2m after 1m is Inverted minors, with nothing about subsequent developments.
A jump shift in D would be a forcing raise, so maybe there aren't many other forces.

[johnu]

zhasbeen, on 2018-October-02, 08:59, said:

Click on:
http://www.bridgebas...ystem_notes.php
Then select “Click here” link at top of page to see GIB convention card
See “Other” under Minor Openings where it says “2C after 1D opening not GF”

That may be true, but the opening bid was 1♣, not 1♦

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[johnu]

pescetom, on 2018-October-02, 10:53, said:

AFAICS the GIB CC just says that 2m after 1m is Inverted minors, with nothing about subsequent developments.
A jump shift in D would be a forcing raise, so maybe there aren't many other forces.

The direct raise to 3♦ should be preemptive, not a forcing raise.

[helene_t]

.

[smerriman]

I don't understand inverted minors either..

---

[helene_t]

Sorry for going off-topic:

steve2005, on 2018-September-28, 19:41, said:

The problem is there seems to be no diamond stopper.

This is probably true (in the gib system) but it shouldn't be.

1♣-2♣
2♥-?

Opener has denied a diamond stopper so without a diamond stopper, East can either sign off or make some move towards 5/6♣. Or maybe ask for half a diamond stopper with 3♦ if that is the agreement. Or maybe 3♥ looking for a Moysian.

2♠ should show a diamond stopper and ask for a spade stopper, at least ostensibly.

[johnu]

smerriman, on 2018-October-02, 21:36, said:

I don't understand inverted minors either..

---

Chalk another one up for good GIB bidding. The description of North's hand perfectly matched the actual hand.

[helene_t]

pescetom, on 2018-October-03, 06:15, said:

A jump shift in D would be 1♣-2♦ and is a forcing raise according to the CC.

No, 2♦ is a Soloway jump shift. The "J/S in other minor" is not ticked.

http://webutil.bridg...e65723d7261696e

[pescetom]

helene_t, on 2018-October-03, 15:07, said:

No, 2♦ is a Soloway jump shift. The "J/S in other minor" is not ticked.

Quite right of course - sorry, I saw "J/S in other minor" in red but not the tickbox that follows.