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 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 advan...
Found on http://en.wikipedia.org/wiki/Rosenkranz_double
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