In the game of bridge, Bergen raises specify a conventional treatment of raising a major suit opening in a five-card major system . This convention is named after Marty Bergen, the developer of this treatment.
When Bergen raises are used, over a 1♥ (1♠) opening the bids of 3♣, 3♦ and 3♥ (3♠) all denote a four (or more) card trump support on hands of variable high card strength:
3♣ – invitational to game (typically 11-12 high card points)
3♦ – weak (typically 7-10 high card points)
3♥/3♠ – very weak (preemptive, typically less than 7 high-card points and four card support)
4♥/4♠ – very weak (preemptive, typically less than 7 high-card points and five card support)
Bergen raises are designed to take advantage of the Law of total tricks, which states that with nine trumps one should compete at the three-level regardless of high card strength.
Reverse Bergen off after interfer except double.
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