Position Specific Doubles
Lesson materials - About Doubles

1. Take-out Double
Made after Opponent's Opening bid or Responder's reply
1♠ - (DBL) =
      shows 4+ hearts and 11-15 pts, or 16+ pts any shape
1♣ - (DBL) =
      shows 4-3+ in the majors and 11-15 pts, or 16+ pts any shape

2. Responsive Double
Made as a Response to a Take-out Double
1♦ - (DBL) - 2♦ - DBL =
      shows both 4-card majors and 6+ pts
1♥ - (DBL) - 2♥ - DBL =
      denies 4 spades and shows both 4-card minors and 6+ pts
2a. Snapdragon
Response to Partner's Overcall, when 3 previous players bid 3 different suits.
It shows 2-card support for the Overcall suit plus the unbid 5+card suit

3. Negative Double
Made as a Response to the Opener and shows the unbid major suit
1♣ - (1♠) - DBL =
      shows 4+ hearts and 6-10 pts, or
      shows 4 hearts exactly and 11+ pts
1♣ - (1♥) - DBL =
      shows 4 spades exactly and 6+ pts
1♣ - (1♥) -1♠ =
      shows 5+ spades and 6+ pts

4. Support Double
Made by the Opener as a response to Partner's new suit bid
1♣ - (Pass) - 1♥ - (1♠) - DBL =
      shows 3-card support for Responder's hearts

© 2017 Michael Furstner