The responses to Romex one bids resembles 2/1 GF. 2/1 responses to a major guarantee a re-bid. If responder re-bids anything except their own suit then a game-force is established. Then what is a jump shift response in Romex? It is a strong jump shift showing 16+ points, a semi-solid or solid six card or longer suit (could be five with a fit for partner), five or more controls, at most five losers, and no side four card suit (except for opener's). As you can see, the jump shift is well defined, so when it comes up you and your partner can accurately bid difficult hands. Unfortunately, these hands are rare...

Opener's re-bids to a Romex Jump Shift are specifically prescribed:

1. With an honor in the Jump Shift suit (even a singleton), opener must raise responder by either:

1. Jumping into a suit to show a void there.
2. A direct raise. After opener raises responder's suit, responder's suit is known to be solid. Responder can raise opener's suit as Keycard Blackwood with opener's suit as trump. Responder may also bid a new suit-- a cue bid (NT re-bids can be used as trump cue bids of opener's suit). In both cases opener's suit is "supposedly" the trump suit; however, responder's own suit may be the final contract.

1. With no honor in the Jump Shift suit, opener re-bids in this order:

1. Jumping in their original suit to show a semi- solid or better suit of at least six cards with extra strength. NOTE: this bid is forcing!
2. Opener re-bids in a concentrated suit-- at least two of the top three honors, but does not show any length or extra length. Opener re-bids in their own suit before a new suit.
3. Without any of the above, opener simply re-bids in the cheapest NT-- whether or not balanced.

Responder can make a "non-forcing" bid by re-bidding their own suit, opener's suit or 3NT. Opener can place the contract or Romex cue bid-- with an ambiguous trump suit. Responder may also re-bid 4NT as Keycard Blackwood with opener's suit as trump. A re-bid of responder's suit establishes their suit as trump. New suits by responder are cue bids with opener's suit as trump.