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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“No convention gets to be a convention at all except by grace of a lot of clever and powerful people first inventing it, and then imposing it on others. You can be pretty sure, if you are strictly conventional, that you are following genius—a long way off. And unless you are a genius yourself, that is a good thing to do.”
—Katharine Fullerton Gerould (1879–1944)