[jdiana]

This has been bugging me since I saw a hand posted on Bridge Winners yesterday. Playing with BBO robots, the bidding started (P)-P-(P)-1♠-(P)-2♦-(P)-3♥. The BW post has disappeared somehow so I can't provide a link but, IIRC, the BBO explanation for the 3♥ bid was something like 13-21 HCP, 14-24 total points.

Playing standard SAYC or 2/1, in a constructive auction where partner is not a passed hand, a jump shift by opener to the two level, e.g., 1♣-1♥-2♠, shows a strong hand (about 18+ points) and is game forcing.

I played two-way Drury so I would not have the BBO auction shown above but, assuming that 2♦ bid is natural, what does opener's jump shift show? (Even assuming we're playing 2/1, that would not apply because partner is a passed hand.)

Playing SAYC, where a 2-level response shows about 10+ points, what would opener's jump shift show, e.g., 1♠-(P)-2♦-(P)-3♥? (This is different from the first auction because responder hasn't limited his hand by passing.) This is not listed as a possible jump shift on Larry Cohen's website - https://www.larryco....and-a-jumpshift

In the link above, under reverses, Larry says: "We are concerned only with auctions where responder bid on the one-level. If responder responds on the two-level, don't think of reverses." Does the same thing apply for opener jump shifts, i.e., do they not exist?

I'm probably just missing something but I'm puzzled.

[mw64ahw]

I used to play this as invitational 55 in the Majors

[TMorris]

I would play it as a splinter in support of diamonds

[smerriman]

The question really is, after the 2♦ bid, is 2♥ forcing?

If so, then you don't need to jump to show a strong hand, like you do after a 1 over 1 response where a simple new suit is NF. And so a level higher than a forcing bid would be a splinter for me.

GIB describes 2♥ as NF which is why that person had to jump in the thread you're referring to, which seems unusual to me. But passed hand 2/1s are so rare, I'd expect a lot of human partnerships don't handle them well either..

[jdiana]

smerriman, on 2024-November-28, 12:44, said:

The question really is, after the 2♦ bid, is 2♥ forcing?

If so, then you don't need to jump to show a strong hand, like you do after a 1 over 1 response where a simple new suit is NF. And so a level higher than a forcing bid would be a splinter for me.

GIB describes 2♥ as NF which is why that person had to jump in the thread you're referring to, which seems unusual to me. But passed hand 2/1s are so rare, I'd expect a lot of human partnerships don't handle them well either..

Thanks Stephen. That makes sense.

[DavidKok]

I prefer to play that 2♥ is forcing here, but had a mixup with a partner a few weeks ago as he thought it was NF and my rebid promised something more.