These opening bids were devised and developed by Mr. Édouard Lachand of France in 1971. They employ the opening of a 5-card Major suit, a weak No Trump range.
Since they are based on the Roman and Super Precision bidding systems, the bidding sequences are controlled by relays and canapé bids to show length and range.
The opening bids are shown in the schematic below. These opening bids are from his publication Le Gamma (La Longue á Relais ou Le Gamma: un système cohérent d'enchères, réunissant les avantages des enchères naturelles et artificielles), published in 1971, with a preface by Mr. Jean-Paul Meyer. Publisher: Éditions de presse spécialisée, Paris, France, LC: 75585447, LCCN: 75585447. See also: Gamma Responses, also developed by Mr. Édouard Lachand.
Opening Bids Only
| Bids |
|
Strength |
|
Meaning |
1  : |
|
12-19 high card points |
|
Shows various shapes. |
1  : |
|
12-19 high card points |
|
Shows a 3-card plus Diamond suit. |
1  : |
|
10-19 high card points |
|
Shows a 5-card plus Heart suit. |
1  : |
|
10-19 high card points |
|
Shows a 5-card plus Spade suit. |
| 1 NT: |
|
12-14 high card points |
|
Shows balanced shape. |
| 2 : |
|
24+ high card points |
|
Shows any shape. |
| 2 : |
|
21-23 high card points |
|
Shows balanced shape. |
| 2 : |
|
8-12 high card points |
|
Shows a 6-card plus Heart suit. |
| 2 : |
|
8-12 high card points |
|
Shows a 6-card plus Spade suit. |
| 2NT: |
|
|
|
Employed as a transfer to Clubs. |
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.