Romex system

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The Romex system is a bridge bidding system designed by the Mexican bridge expert George Rosenkranz. Key feature in Romex is the use of the 'dynamic' 1NT opening indicating balanced or unbalanced hands in the range of 19-21 hcp. One-level openings in Romex are natural with 3+ minors and 5+ majors and limited by the failure to open 1NT.

The most common responses to the dynamic 1NT 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.