Rosenkranz double: Difference between revisions
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The '''Rosenkranz |
The '''Rosenkranz double''' and '''Rosenkranz redouble''' are elememts of a [[contract bridge|bridge]] bidding [[bridge convention|convention]] invented by Dr. [[George Rosenkranz]], collectively known as the [[Rosenkranz double]]<ref>The Official Encyclopedia of Bridge, American Contract Bridge League (Memphis), 2001, ISBN 0-943855-44-6, page 393. </ref>. The [[Glossary of contract bridge terms#call|calls]] are made by the partner of an [[Glossary of contract bridge terms#overcaller|overcaller]] (the [[Glossary of contract bridge terms#advancer|advancer]]) to describe his top honor card holdings in the overcaller’s suit. |
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==Original version== |
==Original version== |
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Revision as of 13:03, 24 March 2011
The Rosenkranz double and Rosenkranz redouble are elememts of a bridge bidding convention invented by Dr. George Rosenkranz, collectively known as the Rosenkranz double[1]. The calls are made by the partner of an overcaller (the advancer) to describe his top honor card holdings in the overcaller’s suit.
Original version
The conventions come into play when the auction has started with: (a) an opening bid by the opponents; (b) a direct overcall by partner at the one-level; and (c) a bid or negative double (i.e. not a ‘Pass’) by the opener’s partner (the responder). Three cases follow: (1) if responder made a bid below two of opener's suit, a ‘double’ by the advancer is a raise of the overcaller’s suit and promises a top honor; (2) likewise, if opener’s partner doubles the overcall, a ‘redouble’ by the advancer has the same meaning; but (3) if, instead, the advancer makes a raise to the two-level in overcaller’s suit, he denies possession of a top honor in that suit. A top honor is either the Ace, King or Queen.
Showing the top honor may allow the overcaller with a serrated holding to lead the suit safely; while denying the top honor (and thereby suggesting strength elsewhere) encourages the overcaller to lead a different suit.
The use of this convention would be inconsistent with Responsive Doubles.[2]
Reverse Rosenkranz
Subsequent to creating the Rosenkranz double and redouble, Rosenkranz announced in a letter published in the ACBL's Bridge Bulletin[citation needed][3] that he had adopted a proposal by Eddie Wold to switch the meaning of the two sequences, so that the advancer's immediate raise now showed the Ace, King or Queen honor, while the double (and redouble) denied it - a treatment known as "Reverse Rosenkranz". The term "Guildenstern" (a reference to Shakespeare's other courtier in the play Hamlet) is also used[citation needed] for these sequences in independent creation of "Reverse Rosenkranz".
The reasoning for the reverse treatment is that a better hand for the bid suit (by virtue of the additional honor strength) should raise the level of the auction to make things difficult for the opponents.
Variations
Munson, created by Kitty Munson Cooper, (or somtimes, "Tolerance Redoubles"[4]) in which the redouble shows shortness (one or two cards) including the ace or king. After a Munson redouble, the overcaller's spot-card lead in his overcalled suit is suit preference for the side suit to shift to.
The Rosencranz redouble is also used to indicate an honor doubleton in overcaller's suit.[5]
The Snapdragon convention is a double by advancer when three different suits have been shown by the other three players, and nobody has jumped. It shows length in the fourth (unbid) suit, and tolerance for partner's suit (10x or better).
External links
References
- ^ The Official Encyclopedia of Bridge, American Contract Bridge League (Memphis), 2001, ISBN 0-943855-44-6, page 393.
- ^ Amalya Kearse, Bridge Conventions Complete, Devyn Press, Inc., (Louisville, KY), 1990, ISBN 0-910791-76-7, page 1012.
- ^ See also his letter to the Bridge World magazine of July 1998, page 19.
- ^ See the Bridge World magazine of May 1997.
- ^ Donald Farwell and Jason Rosenfeld, Bridge Baron Companion, Third Edition, Great Games Products, 2008, ISBN 978-0-9766156-3-7, page 186.
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