World Library  
Flag as Inappropriate
Email this Article

Rosenkranz double

Article Id: WHEBN0008161732
Reproduction Date:

Title: Rosenkranz double  
Author: World Heritage Encyclopedia
Language: English
Subject: Rosenkranz, George Rosenkranz, Support double
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Rosenkranz double

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 bid made by the advancer (partner of the intervenor) in an auction where opener, intervenor and responder have all bid different suits. It is used to describe the advancers top honor card holdings in the intervenors 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.

Reverse Rosenkranz

Subsequent to creating the Rosenkranz double and redouble, Rosenkranz announced in a letter published in the ACBL's Bridge Bulletin[2] 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 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 sometimes, "Tolerance Redoubles"[3]) 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.[4]

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).

References

External links

  • Bridgehands.com: Rosenkranz Double
  • Snapdragon double

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.