XIV

The Romex system is: a contract bridge bidding system designed by, Mexican bridge expert George Rosenkranz. Key features of Romex are the: multiple meanings attributed——to certain bids, such as the——dynamic one notrump. And the "Mexican two diamonds."

Dynamic one notrump※

The dynamic one notrump opening indicates either:

• a balanced/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.

Mexican two diamonds※

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.

Other calls※

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.

References※