The origin of these opening bids are unknown and the designation is also vague. For additional information the interested visitor can contact the Estonian Bridge Federation.
The known values of the opening bids are shown in the schematic below. Source.
Opening Bids Only
Bid Strength Meaning 1 : 16 plus high card points Shows any shape. 1 : 11-15 high card points Shows various shapes. 1 : 11-15 high card points Promises 5 plus Hearts. 1 : 11-15 high card points Promises 5 plus Spades. 1 NT: 15-17 high card points Shows balanced shape. 2 : 11-15 high card points Promises 5 plus Clubs. 2 : 6-10 high card points Shows either a 6-card Heart or a 6-card Spade suit, or 20-21 high card points shows balanced shape. 2 : 6-10 high card points Distribution: 5-5 plus in Hearts and a Minor suit. 2 : 11-15 high card points Distribution: 5-5 plus in Spades and a second suit. 2NT: 11-15 high card points Distribution: 5-5 plus in both Minor suits.
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.
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