Copenhagen is a system of specialized jump overcalls that show two-suited hands. After 1-of-a-suit, the conventional overcalls are:

2NT    At least 5-5 in the lowest two unbid suits
3 At least 5-5 in the top and bottom unbid suits
3 At least 5-5 in the highest two unbid suits


All of partner's responses are natural.


Origins

Copenhagen was invented by Danish players John Trelde and Mr. Gert Lenk.

See also

  • Colorful Cue Bid
    An older, conventional cuebid to show a two-suited hand based on suit color.

  • Ghestem
    An overcall structure for showing any type of two-suited hand.

  • Leaping Michaels
    An extension of the Michaels convention for use after an opposing weak two.

  • Michaels
    A cuebid of an opposing suit to show a two-suited hand.

  • Roman Jump Overcalls
    A set of 2-level jump overcalls that show two-suited hands.

  • Unusual 2NT
    A conventional 2NT overcall to show the two lowest unbid suits.

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