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Copenhagen Convention

All bridge played follows the rules of Contract Bridge, sometimes just called bridge.  Once bridge became a popular game, players have been trying to come up with ways to improve their bidding and playing the hand.  Some have work, and some have not.

The Copenhagen Convention is a jump overcall that shows your partner that you have five cards in two suits.  The suit of the jump identifies which two suits you are holding the five cards.  It used after a 1-opening bed by your partner.

2NT – you hold at least 5-5 cards in the lowest two UNBID suits.  If your partner opens with 1a response of 2NT shows you have 5 cards in Hearts and Clubs (the two lowest unbid suits).

3♣ – you hold at least 5-5 card in the top and bottom UNBID suits.  If your partner opens with 1a response of 3shows you have 5 cards in Spades and Clubs.

3you hold at least 5-5 card in the highest two UNBID suits.  If your partner opens with 1a response of 3 shows you have 5 cards in Spades and Diamonds.

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