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Bergen Conventions

Marty Bergen is a famous bridge player who prefers more conventional bridge. He developed many conventions which are used in Two Over One bidding system.

Opener

Responder

Distribution

1 Spade

1 NT
2 Spades
2 NT
3 Clubs
3 Diamonds
3 Spades
6-12 HCP, Less than 4 cards of Spades (Forcing)
6-9 HCP, 3 cards of Spades
Jacoby 2 NT
7-10 HCP, 4 cards of Spades
10-12 HCP, 4 cards of Spades
2-5 HCP, 4 cards of Spades

In this convention 1 Spade response to 1 Heart openning is natural, shifting suit in 2 levels is natural game forcing as in Two Over One bidding system. If the first opponent doubles the major openning the responses change as follows.

Opener

Opponent

Responder

Distribution

1 Spade

Double

2 Clubs
2 Diamonds
2 Spades
7-9 HCP 3 cards support
7-9 HCP 4 cards support
5-7 HCP 3 cards support

Some players apply 2 Clubs and 2 Diamonds responses just the same as in the first table. The other responses are the same with Two Over One system.

Bidding the other major suit in 3rd level indicates a slam intention with 4 cards support and a void or singleton. Opener asks the  shortness with the cheapest possible declaration or declares game with minimum openning points. This system is known as Concealed Splinter. It's advantage over Splinter Bid is that it gives less information on the singleton or void suit in the case of no slam intention. Bidding is as follows.

Opener

Responder

Opener

Responder

Distribution

1 Spade

3 Hearts

3 Spades

3 NT
4 Clubs
4 Diamonds
Club is void or singleton
Diamond is void or singleton
Heart is void or singleton

1 Heart

3 Spades

3 NT

4 Clubs
4 Diamonds
4 Hearts
Club is void or singleton
Diamond is void or singleton
Spade is void or singleton

Opener

Opponent

Distribution

1 NT

Double
2 Clubs
2 Diamonds
2 Hearts
2 Spades
2 NT
3 Suits
3 NT
Single suited hand, waits partner's 2 Clubs to show
5-4 distribution, one of them is Club
5-4 distribution, one of them is Diamond and the other is a major
5-4 Hearts and Spades
At least 6 cards of Spades
6-5 Minor and Major distribution
At least 7 cards, weak hand
6-5 Major distribution

 And now the responses of the 2nd.Opponent.

Opener

1st.Opponent

Responder

2nd.Opponent

Explanation

1 NT

2 Clubs

Pas

Pas
2 Diamonds
2 Hearts
2 Spades
3 Clubs
2 NT
Willing to play the bidded suit
Willing to play the other suit
At least 6 cards of Hearts
At least 6 cards of Spades
Suport to Clubs
Willing to learn the other suit, and game invitation

Rebids of 2nd.Opponent are in the same manner for 2 Diamonds intervention. 2nd.Opponent rebids Club in lowest possible level in double, 1 NT and 2 NT interventions in order to learn the first long suit of the intervenor.