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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. It is a made by the (partner of the ) in an auction where opener, overcaller and responder have all bid different suits. It is used to describe the advancer's 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 (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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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