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Original Drury convention

The convention was first published in The Bridge World in January 1957.  Murray's presentation of the original convention included the following features:
  • The Drury Two Clubs is an artificial one-round force by a passed hand responding to partner's third or fourth-hand major suit opening bid
  • With a normal opening bid, opener rebids normally but with a light opening hand, he negatives with 2
  • With a distributional hand containing length in opener's major but with less than 9 HCP, responder prempts by jumping to 3 in opener's suit
Reverse Drury

A rebid of 2♦ shows a full opening. While not universally accepted, a bid of 2 by opener after opening 1♠ is also a weakish bid showing 5 spades and 4 hearts (or better). With a good hand (say 15 or more points) opener may simply jump to game (4 of the major suit). Other bids tend to be natural and descriptive, in effect a game try. With an excellent hand, opener may be interested in a slam and will bid accordingly.

Responses by the Drury bidder after the sequence 1M-2C-2D

After opener confirms a full opening hand, the following sequence of rebids is helpful to allow opener to decide if game is possible. The Drury bidder responds to 2:
  • 2 - I have a minimum Drury hand
  • 2♠ - I have a maximum Drury hand but only 3 trumps
  • 2NT - I have a maximum Drury hand with 4 trumps
Two-way Drury

In this variant, the passed hand with 10+ points responds 2♣ to show exactly 3-card support and 2 to show 4-card support or better. This may help opener evaluate the probability of a successful game contract.

Real club (or diamond) suit

If the passed hand has 10+ points and a real club suit (or a diamond suit, when playing two-way Drury), this cannot be shown naturally at the 2-level. One possibility is that a jump to 3♣ (or 3
) shows this hand. An alternative is to use the forcing notrump. A third possibility (and the one recommended when the convention was introduced) is to bid 2♣, then rebid three of the minor. If this last approach is used, opener must be careful about jumping in own suit without extra length.

Variation for 4-card major systems

The above examples are suitable for use with 5-card major systems such as Standard American. Variations are required for use with 4-card major systems such as Acol.

SOURCE:  BridgeGuys.com