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In the card game contract bridge, DONT is a conventional overcall used to interfere with an opponent's one notrump opening bid. DONT, an acronym for Disturb Opponents' Notrump, was designed by Marty A. Bergen, and is therefore also referred to as 'Bergen over Notrump'. Although the method is often criticized for being too nebulous, it remains fairly popular. The convention was first published in ''Bridge Today'' in Bergen's 7-page column in the September/October 1989 issue. ==The convention== 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DONT」の詳細全文を読む スポンサード リンク
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