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DONT features the following calls:
  • Double – shows any single suit (6 or more cards); advancer bids 2♣, after which intervenor corrects to his actual suit
  • 2♣, 2, 2 – shows the bid suit and any higher-ranking suit
  • 2♠ – shows spades (6 or more cards)
There is disagreement as to the use of the 2♠ bid. Some treat it as weaker than the sequence of a double followed by 2♠; others play it as showing a solid (runable) spade suit, and there are other agreements possible. Partners should make their agreement clear before using this convention.

DONT is normally applied as a defense to strong notrump opening bids, but some people have created various modifications to DONT to apply them to weaker notrump openings. The difference is that the bidder shows opening-bid values and the partner of the doubler may pass to convert the single-suited hand into a penalty double.

Against 10-13 (Mini notrump) notrump opening bids:
  • Double is for penalty and shows 13+ points with any shape.
  • 2♣ shows any single suit; the partner should bid 2, after which the intervenor corrects to his actual suit
  • 2, 2, 2♠ shows the bid suit and any higher-ranked suit, with clubs as the highest-ranking suit.
There are variations in the agreed responses, and partners should establish a clear agreement.

One common system of responses is:
  • Pass – Advancer is willing to play in the suit bid. Advancer will often have shortness in a higher-ranking suit or suits.
  • Bid of the next cheapest suit (i.e., 1NT – 2♣ – Pass – 2) – Advancer asks overcaller to bid his other long suit, or pass if the bid is in that suit. Advancer will usually have at least 3-card length in all higher-ranking suits. If Advancer asks for overcaller's other suit and then rebids 2NT after ovcercaller shows it, advancer is making a strong game invitation in the second suit.
However over a 2 bid (1NT – 2 – Pass) a bid of 2♠ is simply a preference for the other known         suit, and shows much the same strength as would a raise of the heart suit. Similarly a bid of 3♠ (1NT – 2– Pass – 3♠) would tend to be preemptive.
  • Bid of a new suit that is not the cheapest suit (1NT – 2♣ – Pass – 2 or 2♠) – Natural, showing advancer's own 6-card or strong 5-card suit.
  • A raise of overcaller's 2♣ or 2 overcall or rebid tends to be preemptive.
  • A raise of overcaller's major-suit overcall or rebid is mildly invitational. 2NT shows the strong invitation.
Others treat this as weak also, and insist that all invitational sequences go through 2NT.
  • 2NT – A strong game invitation that asks overcaller to bid the other long suit at the 3-level (or 4-level, if the second suit is a major and overcaller is strong enough to accept the invitation). Advancer promises excellent support for all higher-ranking suits.

SOURCE:  Wikipedia contributors. "DONT." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 4 Mar. 2013. Web. 30 Mar. 2013.