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The Rosenkranz double and Rosenkranz redouble are elements of a bridge bidding convention invented by Dr. George Rosenkranz, collectively known as the Rosenkranz double. [1] It is a double made by the advancer (partner of the overcaller) in an auction where opener, overcaller and responder have all bid different suits. It is used to describe ...
The snapdragon double (also known as competitive double, fourth-suit double, or impossible double) [1] [2] is a bidding convention in contract bridge.It is a call of double by fourth hand, when three different suits have been bid by the first three players and shows a good holding in the fourth suit (generally six cards, though some partnerships allow five) and tolerance for partner's suit.
In American Contract Bridge League (ACBL) tournaments, support doubles must be indicated on the convention card and must be Alerted. Additionally, when opener makes a call other than a support double (including Pass) when the support double is an option, an Alert should be made if the partnership agreement is that opener's failure to double or ...
The book is aimed at beginners, with each chapter outlining a single convention, including takeout doubles, negative doubles, and cuebid raises. [1] All chapters are followed by a quiz. Since its publication, the book has sold over 300,000 copies, [2] and won the American Bridge Teachers' Association Book of the Year (Student) award. [3]
A bridge convention is an agreement about an artificial call or a set of related artificial calls. Calls made during the auction phase of a contract bridge game convey information about the player's card holdings.
Double: shows a single minor or both majors; advancer bids 2 ♣, after which the intervener corrects to his actual suit if a minor, or hearts if holding both majors 2 ♣ or 2 ♦: shows the bid suit and a major 2 ♥ or 2 ♠: shows the bid suit 2NT: shows the minors
The Jacoby 2NT is used to show a game-forcing raise of a major suit with four-card support. Negative doubles are used through the level of 2 ♠. Fourth suit forcing is used. Michaels cuebid and Unusual notrump are used. Conventions are specified as being "off" in response to a 1NT overcall, except that 2 ♣ is still Stayman.
This is a list of bidding systems used in contract bridge. [1] [2] Systems listed have either had an historical impact on the development of bidding in the game or have been or are currently being used at the national or international levels of competition. Bidding systems are characterized as belonging to one of two broadly defined categories: