[manudude03]

Stefan_O, on 2016-May-28, 09:08, said:

But again -- Why?

If you open 4144 with 1♦, the only time you can even have a ♦-suit is the rare 4045.

What you normally are interested to know here is:
- Does responder have 4 or 5 hearts?
- Does responder have extra strength or not?

Wanna play in diamonds? I think (almost) never... Much more likely to only help defenders by bidding 2♦ naturally...

It's to allow you to play 5C (or even 4S) when it is right if partner's hearts were particularly weak. If you want to check for a heart fit, then bid hearts. Meanwhile any bid (except maybe 2C) shows extras.

[Stephen Tu]

Stefan_O, on 2016-May-28, 09:08, said:

What you normally are interested to know here is:
- Does responder have 4 or 5 hearts?
- Does responder have extra strength or not?

- Responder denied extra strength by rebidding 1nt. If opener merely wants to bid 3nt if max for 1nt he can just bid 2nt.
- Opener is only interested in the fifth heart if he has extra values with 3 hearts. With that hand opener can just bid 2H.

Playing 2♦ as artificial in my mind only makes some sense if you want to play a style where opener always bids 2H with 3 without extras, on 4333/4324 type shapes, catering to responder having 5cd hearts, like Steve Robinson in "Washington Standard" advocates, which I don't think is mainstream.

Quote

Wanna play in diamonds? I think (almost) never... Much more likely to only help defenders by bidding 2♦ naturally...

Partner can be 5-5 or 4-6 in the reds pretty easily, might well want to play in diamonds.

[Stefan_O]

Stephen Tu, on 2016-May-28, 10:03, said:

- Responder denied extra strength by rebidding 1nt.

I meant extras relative to his minimum limit
1NT is pretty wide range -- like 6-10 or so...

Stephen Tu, on 2016-May-28, 10:03, said:

Playing 2♦ as artificial in my mind only makes some sense if you want to play a style where opener always bids 2H with 3 without extras, on 4333/4324 type shapes

What abt a minimum 4315 (or even 4306 at MP) with ♥HHx or so?
Opener has not shown a balanced hand here...

Stephen Tu, on 2016-May-28, 10:03, said:

Partner can be 5-5 or 4-6 in the reds pretty easily, might well want to play in diamonds.

Well, once in a blue moon it might be better than NT perhaps...
But if accepting game-invite, even if 2♦ is artificial, responder can still show 5+suit with 3♦, if he feels unsure where to play.

[iandayre]

lycier, on 2016-May-01, 07:17, said:

Good topic.
See Gib CC :

1♦ - 2♣ : 2♣ only promises 11+hcp, forcing to 3nt
1♦ - 3♣: Soloway jump shift to show rebiddable ♣ with 17+TPs.

Now few people use Soloway jump shift, but Gibs use it, I'm not familar with its complete bidding constructure : I have no idea hw to show invitational sequence, sign off, slam and forcing sequences including splinter sequences etc, it seems only BBO knows it.

I am a huge proponent of Soloway SJS, but only at the two level. I believe I can answer any questions about how to proceed after making one, or if your GIB partner makes one. Of course in "human best hand" tournaments, an SJS by GIB is extremely rare! I have seen only one.