The origin of this variation is unknown. One revised variation follows and is generally designated as Revised DONT. Compare with the original version of DONT.

The original concept was devised by Mr. Marty Bergen and published by Mr. Larry Cohen. The original designation for this conventional defense method is Bergen Over No Trump, but the designation change has been accepted into the language of the bridge community as simply D.O.N.T.

As with all devised concepts to be employed as defense methods against No Trump, this concept has also been altered, varied, modified, and revised to meet the needs of individual partnerships.

Overcalls Following No Trump by Opponent

Opponent   Overcaller Meaning
1 NT     Generally announced as 15-17/18 points.
    Double Promises a single suit in Clubs or Diamonds or promises both Major suits.
    2 Shows Clubs and an unknown higher-ranking suit.
    2 Shows Diamonds and an unknown higher-ranking suit.
    2 Shows a single-suit in Hearts.
    2 Shows a single-suit in Spades.

Responses by Advancer

The responses of the advancer and the rebids of the overcaller are generally an agreement of the partnership. These may depend on the state of vulnerability, the number of Losing Tricks, the actual location of working values, and/or the range of the No Trump opening or a combination thereof. Jump responses may indicate a stronger holding and jump rebids may indicate a longer than required suit. The idle bid of 2 No Trump may also be employed to impart certain information when a suit bid is not available.



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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