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Responsive Double - When Opponents Bid And Raise (OBAR) in one suit over partner's interceding overcall, a popular treatment by advancer is the Responsive Double.  The Responsive Double shows length and values in the unbid suits with values similar to the Negative Double. 

Common strength requirements for the Responsive Double are similar to the Negative Double, considering Environmental Factors:

Bidding Level

Points

1 Major or 2 Minor

8

2 Major

9+

3 Level

10+

Examples of auctions that illustrate Responsive Doubles:

1.

(1D) -    X    - (2D)  -   X;

2.

(1C) -   1H   - (2C)  -   X;

3.

   P    - (1H) - (1S)  - (2H);
(X)

4.

(1S) -   2C   - (2S)   -   X;

5.

(1D) -  1S    - (3D)  -   X;  OBAR jump by opponent which could be weak/strong,
                                      Responsive Double still "on" here, but see bottom

Examples of auctions that are not Responsive Doubles:

1.

(1D) - 1N - (2D) - X;   Agreement needed (Penalty, Transfer, or Takeout)

2.

(1C) - 1H - (1S)  - X;   No OBAR, agreement needed (Penalty or Takeout)

3.

(1C) - 2H - (3C)  - X;  OBAR irrelevant with partner's preemptive jump
                                (as Inverted Minors), thus the Double is for penalty

Partnership agreements needed here:

  Classic Approach Modern Approach
1.

(2D) - 2H - (3D)  - X;

OBAR "off" with preemptive opening bid, thus Penalty

Responsive, opponents' should not own auction with preemptive bidding

2.

(3D) - X - (4D) - ?;

Same

Still Responsive, but how high - 3S ?   4D ?

Also see other Doubles, particularly Takeout Double, Negative Double, and books on Doubles

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