Hi All,
Because the nature of the 1S(=D) opening is quite different from that of the 1R(ed) openings, the placement of the emphasis on the response structure varies as well. The “Pivot”, however, will be kept: it’s effectiveness will be reviewed over time. So the response structure …
- 1NT: R, much as for the major suit openings (i.e. strong, or moderately strong without clear direction, a 1NT’ish type of hand and maybe some raises)
- 2C: Puppet to 2D
- 2D: 2D (sometimes 3), little if any game interest
- 2H: 5+H, NNF, <4S
- 2S: 5+S, NNF, <4H
- 2NT: 4+D INV or FG ART SPL
- 3C: Pass (with 4+C) or Correct
- 3D: 3D (sometime 4), little if any game interest
- 3H: Fit-showing, 6+H, usually only 3D
- 3S: Fit-showing, 6+S, usually only 3D
- 3NT: To play
- 4C: Fit-showing, 6+C, 3+D
- 4D: PRE
- Game: To play
It is probably worth noting what is planned for the 5+/4+ both majors hands, Constructive or better. These will be handled via the 2C pivot. The full continuation spectrum is still to planned, but
- 1S 2C 2D 2H will show 5+H & 4+S (NF)
- 1S 2C 2D 2S will show 5+S & 4H (NF)
MOSCITO2007, for those interested, handles these directly over 1S and in transfer fashion (2C = 5+S/4+H, 2D=5+H [and presumably possibly 4S], 2H = 5+S). I prefer the approach chosen for DIP as I prefer NNF rather than transfers where the auction is not definitiely constructive in nature, and, the both major versions are relatively less frequent. Also, going through the pivot allows the variants with either major longer to be shown explicitly.
There is some case for the pivot initially to be treated as a form of diamond raise (maybe a BAL INV). In which case, opener would have the option of not bidding 2D if “accepting”, and then taking into account the other possible hand types responder might have and selecting the 2H+ rebid accordingly (and, as is typically the case with auctions of this nature, making the first bid which would have been passed were it responders rebid).
Regards, DipBridge
