Rosenkranz double: Difference between revisions
a double is not a bid (it is a call) |
created by Kitty Munson Cooper (no hyphen); attend hyphen/dash; attend apost/qmark and reword there |
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==Original version== |
==Original version== |
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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]] ( |
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]] (that is, not a Pass) by the opener's partner, responder. Two cases follow: (1) if responder bids below two of opener's suit, Double by advancer is a raise of the overcall and promises a top honor; (2) if responder doubles, Redouble by advancer has the same meaning. Either way, advancer's natural raise to the two-level denies possession of a top honor in that suit. A top honor is either the Ace, King or Queen. |
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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. |
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. |
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==Reverse Rosenkranz== |
==Reverse Rosenkranz== |
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Subsequent to creating the Rosenkranz double and redouble, Rosenkranz announced in a letter published in the ACBL's Bridge Bulletin{{Citation needed|date=January 2011}}<ref>See also his letter to |
Subsequent to creating the Rosenkranz double and redouble, Rosenkranz announced in a letter published in the ACBL's Bridge Bulletin{{Citation needed|date=January 2011}}<ref>See also his letter to ''The Bridge World'' magazine of July 1998, page 19.</ref> 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|date=January 2011}} for these sequences in independent creation of "Reverse Rosenkranz". |
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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. |
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. |
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==Variations== |
==Variations== |
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''Munson |
''Munson'' (or "Tolerance Redoubles")<ref>See the Bridge World magazine of May 1997.</ref>, created by [[Kitty Munson Cooper]], in which the redouble shows shortness (one or two cards) including the ace or king. After a ''Munson'' redouble, overcaller's spot-card lead in his suit is a {{gcb|SPS|suit preference signal}} of which shift to a side suit overcaller prefers. |
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The Rosencranz redouble is also used to indicate an honor doubleton in overcaller's suit.<ref>Donald Farwell and Jason Rosenfeld, Bridge Baron Companion, Third Edition, Great Games Products, 2008, ISBN 978-0-9766156-3-7, page 186.</ref> |
The Rosencranz redouble is also used to indicate an honor doubleton in overcaller's suit.<ref>Donald Farwell and Jason Rosenfeld, Bridge Baron Companion, Third Edition, Great Games Products, 2008, ISBN 978-0-9766156-3-7, page 186.</ref> |
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==References== |
==References== |
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{{reflist}} |
{{reflist |25em |
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}} |
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==External links== |
==External links== |
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*[http://bridgehands.com/R/Rosencrantz_Double.htm Bridgehands.com: Rosenkranz Double] |
*[http://bridgehands.com/R/Rosencrantz_Double.htm Bridgehands.com: Rosenkranz Double] |
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*[http://www.doublesqueeze.com/2008/10/snapdragon-doubles-and-redoubles.html Snapdragon double] |
*[http://www.doublesqueeze.com/2008/10/snapdragon-doubles-and-redoubles.html Snapdragon double] |
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{{WPCBIndex}} |
{{WPCBIndex}} |
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Revision as of 16:13, 31 October 2014
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 intervenor) in an auction where opener, intervenor and responder have all bid different suits. It is used to describe the advancer's 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 (that is, not a Pass) by the opener's partner, responder. Two cases follow: (1) if responder bids below two of opener's suit, Double by advancer is a raise of the overcall and promises a top honor; (2) if responder doubles, Redouble by advancer has the same meaning. Either way, advancer's natural raise to the two-level 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[citation needed][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[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 (or "Tolerance Redoubles")[3], created by Kitty Munson Cooper, in which the redouble shows shortness (one or two cards) including the ace or king. After a Munson redouble, overcaller's spot-card lead in his suit is a suit preference signal of which shift to a side suit overcaller prefers.
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
- ^ Francis, Henry G., Editor-in-Chief; Truscott, Alan F., Executive Editor; Francis, Dorthy A., Editor, Sixth Edition (2001). Official Encyclopedia of Bridge, 6th Edition. American Contract Bridge League (Memphis, TN)). ISBN 0-943855-44-6.
{{cite book}}:|first1=has generic name (help)CS1 maint: multiple names: authors list (link) Page 393. - ^ 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.