One Level Opening Bids

One Level Opening Bids and Continuances

The first call in the auction other than a pass equals an opening bid. Opening bids are generally and frequently made on the one level, of which there are five possible bids. The principle behind such opening bids on the one level has, as its foundation, the idea that a partnership can exchange more information and communicate length and strength via bids more accurately if the call is made on the one level.

The attempt has been made to list such conventional methods, treatments, and approaches in the game of bridge, which employ an opening bid on the one level. The list includes opening bids, which may either be forcing and/or non-forcing, which may become different in the normal continuances owing to competition.

For opening bids, which are always one-round forcing, we recommend that the bridge student visit our list of such opening bids: Artificial Opening Bids. The following list contains primarily those methods, which employ natural opening bids.


Carrot Club 1 No Trump Opening
The opening of 1 No Trump shows a range between 14 and 16 high card points. Any holding with fewer or more high card points may not be opened with 1 No Trump. This limiting bid does not exclude the No Trump bidder from remaining an active participant in any continuing bidding sequences.

Fourth Suit Forcing
A convention, whereby the rebid of the unbid fourth suit, generally by the responder, is forcing for at least one round.

Jacoby Two No Trump - Jacoby 2 No Trump - Jacoby 2 NT
This conventional method was originated by Mr. Oswald Jacoby. The concept was devised to be employed only by Major suit opening bids in conjunction with the Limit Raises conventional method. It is this feature, which is important for the bridge student to remember, and that this conventional method is employed in conjunction with limit raises, and not a limit raise per se.

Long Suit Trials - Help Suit Game Try - Short Suit Trials - Weak Suit Game Tries - Counter Trial
All designations refer to the same concept of allowing the partnership to continue to exchange information following an immediate suit fit. The underlying concept is to determine whether the combined cards, following a first response of a single raise, are distributed in such a manner as to attempt a game contract.

Reverse Bids - A method to show No Trump strength without No Trump distribution.

Ingberman Convention - This is not a variation of the reverse bid, but rather a concept devised by Mr. Monroe Ingberman to be used by the responder of a Reverse bidder to show minimum values through a Relay bid of 2 No Trump.




If you wish to include this feature, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible.

email convention links
Claus and Raymond Conventions Bridge Sites
home back home
Home Page Glossary Home Page II