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  2. 2/1 game forcing - Wikipedia

    en.wikipedia.org/wiki/2/1_game_forcing

    1 ♠ – 22 ♠ – 2NT. Forcing to game, with balanced hand and a good club suit. 1 ♠ – 22 ♦ – 3 ♣ Forcing, unless the partnership has agreed that this is an exception to the "2/1 rule." 1 ♦ – 2 ♣ Forcing for one round only (as in Standard American), except in the variant of 2/1 where this sequence is game forcing as ...

  3. List of defenses to 1NT - Wikipedia

    en.wikipedia.org/wiki/List_of_defenses_to_1NT

    This is a list of defensive conventions used in the game of contract bridge to compete in the bidding after the opponents have opened with a one notrump (1NT) bid. ANTI Aspro [ 1 ] [ 2 ]

  4. XYZ convention - Wikipedia

    en.wikipedia.org/wiki/XYZ_convention

    For example, on the sequence 1 ♣-1 ♠ (with or without opponent's interfering);1NT-2 ♣;2 ♦,2 ♥ will show an invitational hand with minimum five spades and four hearts, 2 ♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3 ♣ typically an ...

  5. Jacoby 2NT - Wikipedia

    en.wikipedia.org/wiki/Jacoby_2NT

    Jacoby 2NT (Swedish: Stenberg 2NT) is a bridge convention in which a bid of 2NT over partner's opening bid of one heart (1 ♥) or one spade (1 ♠) shows a hand with both opening strength or better - normally at least 12 HCP or a hand meeting the "Rule of 20" criteria, and; at least four-card support for opener's major suit.

  6. Duplicate bridge - Wikipedia

    en.wikipedia.org/wiki/Duplicate_bridge

    Duplicate bridge is a variation of contract bridge where the same set of bridge deals (i.e., the distribution of the 52 cards among the four hands) are played by different competitors, and scoring is based on relative performance. In this way, every hand, whether strong or weak, is played in competition with others playing identical cards, and ...

  7. Unusual notrump - Wikipedia

    en.wikipedia.org/wiki/Unusual_notrump

    In the card game of bridge, the unusual notrump [1] is a conventional overcall showing a two-suited hand. It was originally devised by Al Roth in 1948 with Tobias Stone, [2] to show the minor suits after the opponents opened in a major. The convention concept is now generally extended to show the "two lowest unbid" suits.

  8. Drury convention - Wikipedia

    en.wikipedia.org/wiki/Drury_convention

    The Drury convention is a bridge convention, used to show a game-invitational major suit raise by a passed hand while guarding against a light opening by partner in third or fourth seat. It is initiated by an artificial and forcing 2 ♣ response by the passed hand to a 1 ♥ or 1 ♠ opening by partner.

  9. Glossary of contract bridge terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_contract...

    One over one, or one-over-one (1/1) To an opening one-bid, any one-level response in a suit; that is, one of a higher suit in response to opening one of a lower suit. Contrast Two over one. One round force A bid that requests partner to ensure that the bidding continue for at least one more round.