[Siegmund]

Scoring: MP

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The popular auction (at my table and others) was 1♠-1NT, 3♦-4♦, 5♦, which enjoyed varying degrees of success around the room. Oddly nobody in the room found the unbeatable 4S.

[Jlall]

4D is very poor, north has an automatic 3S bid.

[pooltuna]

Jlall, on Jan 2 2010, 07:17 PM, said:

4D is very poor, north has an automatic 3S bid.

Actually I thot 4♦ was too rich for my blood and preferred 3♠

[gnasher]

Even after 4♦, South should offer a choice with 4♠. That's where he wants to play opposite J Qxx 109xx Axxxx, as well as any hand with no ace.

[ONEferBRID]

For these strong 2-suiter ( M/m ) hands ( where 3m-jump is regarded as GF ),
I have a system for Responder to show key cards with support hands for Opener's 2nd suit-- Diams in this case:
1S - 1NTF!
3D - ??

The rebids for Major support or support for neither are:
3S = minimum, could be as little as 2 card Sp support
4Sjump = limit raise w/ 3 cards ( a hand that would have jumped to 3S after an Opener minimum rebid of say, 2D )
3NT = dislike either of Opener's suits

The remaining "out of focus" bids are then key card "showing" and at least 4 cards Diam, but does not deny 2 cards Sp:

3H! = 0 or 3
4C! = 1 or 4
4D! = 2 - dQ
4H! = 2 + dQ

After 4C!, Opener now knows they are missing 2 Aces and bids 4S for pass or correct to 5D:

1S - 1NTF!
3D - 4C!
4S - pass

[nige1]

[effervesce]

4♦ is crazy - it is a slam try in diamonds! Over which 4♠ should be a cuebid.

Agree 3♠ is normal.

[Siegmund]

I too interpreted 4D as a slam try in diamonds (and it was an aces-first cuebidding partnership.)

I sure do wish I had better agreements after opener's jump shifts, but I've never had any with any of my partners... so I am mining the forum for ideas

[ONEferBRID]

Here's another example for you, Sieggy... I wonder how many here could get to 7D ??

It illustrates another gimmick in my system-- one that even Ken Rexford might approve of. After "showing" key cards with 4+ support for Opener's minor ( or 2nd suit), the Queen in Opener's Major is an important card that is included in any subsequent trump Q-ask or K-ask:

North
A x
A K J x x
A Q J x x
x

South
x x x
Q x
K T 9 8 x
A T x

1H - 1NTF!
3D - 4D! = 2 - dQ
4S! - 5H = hK or hQ
7D ! ! ( South can pre-count 1s, 5h, 5d, 1c and a black suit ruff

- - - - - - - - - - - - - - - - - - - - - - - -
Responder's choices after the 3D strong-jump-shift:
3H = minimum, could be as little as 2 card Ht support
4H-jump = limit raise w/ 3 cards ( a hand that would have jumped to 3H after an Opener minimum rebid of say, 2D )
3NT = dislike either of Opener's suits

The "out of focus" bids are RKC "showing" for Opener's minor w/4+Diam, but does not deny 2 cards Hts ( or possibly 3 ):

3S! = 0 or 3
4C! = 1 or 4
4D! = 2 - dQ
4S! = 2 + dQ

After the 4D!, then Opener bid 4S! = specific K-ask ( the next-non-sign-off step; 4H and 4NT would be sign-offs )

Responder's replies to 4S!:
4NT = sK
5C = cK
5D = no outside K
5H = hK or hQ ( the only feature-showing bid that is allowed above 5-minor [5D] )

[ Usually, but not guaranteed, in these SJS auctions, Opener will have 2 of the top 3 honors in his Major].

[ArtK78]

gnasher, on Jan 3 2010, 04:56 AM, said:

Even after 4♦, South should offer a choice with 4♠. That's where he wants to play opposite J Qxx 109xx Axxxx, as well as any hand with no ace.

It is not unusual in a partnership without too many gadgets to jump shift to a 2 or 3 card suit with a very strong one-suited hand (just short of a 2♣ opening).

That would be my interpretation of the 4♠ bid over 4♦. It would not be offering a choice of contracts.