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This convention is alertable in ACBL regulations.[1]

A support double, when used, is made when RHO overcalls partner's response, which may show only 4 cards. Here is an example:

South West North East
1 / 1 1
X

The double shows exactly 3 s, then opener can decide whether to go on or do something else.

ReferencesEdit

  1. [1] Doubles, Redoubles and Passes : Doubles, Redoubles and Passes with highly unusual or unexpected meanings
Doubles

penalty double - takeout double - negative double - responsive double
support double - maximal double - Lightner double - lead-directing double
optional double

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