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. The 2♣ bid shows at least 3-card support for opener's suit with 10-12 support points and asks opener to clarify the strength of his opening hand.
Read more about Drury Convention: Origins and Purpose, Responses By The Drury Bidder After The Sequence 1M-2C-2D, Two-way Drury, Real Club (or Diamond) Suit, Variation For 4-card Major Systems
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