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Good Bad 2 Notrump - An artificial bid of 2 Notrump, typically when both sides are competing in a lively auction and partner has a limited hand with no interest in game.  Most commonly, the rebidder makes a raise of a previously bid suit or a new suit at the 3 level to show a stronger action than a 2N overcall above the Right Hand opponent two-level bid. 

Bidding Good Response Bad Response

1.

1H - (P) - 2H - (2S);
?

1H - (P) - 2H - (2S);
3C/D/H

1H - (P) - 2H - (2S);
2N

2.

1H - (1S) - 2C - (2S);
?

1H - (1S) - 2C - (2S);
3C/D/H

1H - (1S) - 2C - (2S);
2N

3.

1C - (1D) - X - (2D);
?

1C - (1D) - X - (2D);
2H/S/3C

1C - (1D) - X - (2D);
2N

4.

(1H) - X - (2H) - ?

(1H) - X - (2H) - 2S/3C/3D

(1H) - X - (2H) - 2N

5.

1D- (P) - 1H - (2S);
?

1D- (P) - 1H - (2S);
3C/D/H

1D- (P) - 1H - (2S);
2N

Note that in the first 3 examples the Good Bad bid is made by the opening rebidder.  The 4th example is an exception - since opponents have Bid And Raises (OBAR), the advancer's bid is "Good Bad" rather than balancing with a natural Notrump bid.  Example 5 is played as "Good Bad" by many who play the system - for others the bid is natural showing stoppers.

Good Bad 2 Notrump does not apply in these auctions:

1.

1H - (2D) - 2N

Right Hand Opponent shows opening values

2.

1H - (1S) - 2N

Right Hand Opponent makes a 1 level bid

3.

1H - (2H) - 2N

Right Hand Opponent makes a cuebid

4.

1H - (P) - 1S - (1N);
2N

Opponent makes a conventional call, such as a Sandwich Notrump showing a two-suited weak hand

5.

(1C) - P - (1D) - 1S;
(2C) - 2N

Opponents play a "strong Club" system, opening with an artificial bid

6.

(1H) - 2C - (X) - 2N

Right Hand Opponent does not make a suit bid

7.

1N - (2H) - 2N

Right Hand Opponent overcalls partner's 1 Notrump opening bid

8.

1D - (1S) - 2D - (P);
2N

Right Hand Opponent has passed.

9.

1N - (2H) - 2N

Right Hand Opponent overcalls partner's 1 Notrump opening bid

Also see page 112 in Marty Bergen's Better Bidding With Bergen: Volume 2 - Competitive Bidding, Fit Bids, and More
 

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