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The Romex system is a contract bridge bidding system designed by Mexican bridge expert George Rosenkranz.[1] Key features of Romex are the multiple meanings attributed to certain bids, such as the dynamic one notrump and the Mexican two diamonds.
The dynamic one notrump opening indicates either:
- a balanced or unbalanced hands in the range of 19-21 high card points (HCP) and six controls, or
- an unbalanced hand just short of a 2♣ opening.
The most common responses to the dynamic one notrump opening are:
- 2♣ – negative (0-5 HCP)
- 2♦ – 6+ HCP, game force.
Higher-level responses indicate control count.
A consequence of the use of the dynamic notrump is that the 1NT rebid by opener becomes wide-range (typically 12-16 hcp). With game invitational values or better, responder reacts to such a rebid with a 2♣ checkback convention to ask opener to further describe his hand.
This opening indicates one of four hands:
- a balanced hand with 21-22 points and seven controls
- a balanced hand with 27-28 points and 10 controls
- an unbalanced game-forcing hand with diamonds as the longest suit or
- a three-suited game-force hand.
One-level and 2♣ openings are as per Standard American with 3+ minors and 5+ majors and limited by the failure to open one notrump.
Romex employs special asking bids in lieu of cuebidding, and for slam investigation.
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