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...
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