Submarine Roman 2D/Submarine Mini-Roman
An opening bid of 2 Diamonds to show a three-suited hand of 17-20HCP or 10-14 HCP if playing Mini-Roman The opener may have a five card mnor suit (4-5-5-0), but most partnerships do not permit an opening with a five card major. Responder bids 2NT to ask opener to bid the short suit. Unlike the standard Roman 2D and Mini-Roman, however, opener bids the suit below the shortness. Opener bids spades to show club shortness. This allows responder to pass at a cheaper level, and to use the short suit as a cue bid to force to game and beyond.
N E S W
2D! pass 2NT pass
3H! pass pass pass
Playng Submarine Roman 2D, opener bids 2D to show the strong three suited hand. Responder bids 2NT, hoping for a major suit game if the shortness is in clubs. Opener reibd 3H to show shortness in spades, responder's best suit. Responder signs off by passing. Had the partnership been playing standard Roman 2D, responder would've been forced to sign off at the three level.
Thanks to Wei-Hwa Huang, at firstname.lastname@example.org, for submitting this convention.