After a suit overcall of
partner's one-level suit opening, an immediate double
(through 4D) is for takeout with 7+ HCP at 1-2 level and 9+ at 3-4 level.
REBIDS BY OPENER
- If there is exactly 1unbid
major, double promises at least 4-card in
- If there are 2 unbid majors,
double promises at least 4-card in one of the majors.
- If both majors have been bid,
double promises at least 4-card in each minor suit.
REBIDS BY NEGATIVE DOUBLER
- Any minimum bid:
- Any jum bid:
16-18 HCP, invitational.
19+ HCP, forcing.
Converts the negative double into penalty.
- 1NT or new suit:
Natural, maximum 10 HCP, non-forcing.
- 2NT, single raise, or jump
preference: 11-12 HCP, invitational.
13+ HCP, forcing.
- Any game bid:
Natural and sign-off.