Support double redouble
The support double is a double by opener to show 3-card support for responder's major suit.
Conditions:
current bid is bellow 2♠ or current bid = 2♠ and supported suit = ♠;
responder must have bid a major.
Support double/redouble is opener's first priority and must be alerted.
Further the hand evaluation and the calculated bid.
R E F E R E N C E S