The Rosenkranz Double is used when your LHO (left-hand opponent) opens the bidding, partner makes an overcall, and RHO (right-hand opponent) also bids. A double is artificial, showing 3-card support for partner's suit with at least one of the top three honors.


K73
H83
DKQ93
CT873
West     
1D
North    
1S
East     
2C
South    
Double 1


(1) Rosenkranz double, showing 3-card spade support with a top spade honor.


In contrast, a simple raise of partner's suit denies a top honor in that suit. For example:

9873
HAK5
DJT9
C965
West     
1C
North    
1D
East     
2C
South    
2D 1

(1) Rosenkranz, showing a 3-card diamond raise without a top diamond honor.


Rosenkranz doubles are used through the 2-level. The choice must exist to either (re)double or raise partner's suit to the 2-level.

Both the direct raise and the double show 6-10 points. A stronger hand with support must cuebid instead to show 10+ points.

The Rosenkranz double is named for inventor George Rosenkranz, a preeminent Mexican expert. The purpose of the convention is to help partner on defense should the opponents win the auction.


Examples

73
HA54
DK7532
C973
West     
1D
North    
1H
East     
1S
South    
Double 1


(1) Rosenkranz double, showing 3-card heart support with a top heart honor.


QJ3
H842
DJ53
CA854
West     
1D
North    
1S
East     
Double (1)
South    
Redouble 2


(1) Negative double
(2) Rosenkranz redouble for spades. The convention is applicable as a redouble if RHO makes a double.

See also

  • Snapdragon Double
    A conventional double by fourth seat after the first three players bid three different suits.

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