Copenhagen

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

Overcall	Meaning
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.

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.

Bridgebum began in 1999 and covers a large set of descriptions of bidding conventions, declarer play and defense, and more.

Meckwell Defense to 1NT
A defensive bidding structure for use against both weak and strong 1NT opening bids.

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