Bridge Convention Library

A one-round forcing response to a major-suit opening, central to many Two Over One Game Force systems.

Artificial jump-shift responses after a major opening that show four-card support and different raise strengths.

A 4NT bid used to ask partner how many aces they hold before deciding whether to bid slam.

A notrump-defense structure that lets overcaller compete with several shapely hand types after the opponents open 1NT.

A 2C inquiry after opener rebids 1NT, used to look for delayed major-suit fits and clarify opener's shape.

A defense to an opponent's 1NT opening where double shows a one-suiter and two-level bids show two-suited hands.

Defensive agreements for answering ace-asking or key-card asks after the opponents interfere.

A passed-hand convention using 2C after partner opens a major in third or fourth seat to show invitational support.

A void-showing ace or keycard ask that tells partner to ignore the excluded suit.

An artificial 2D opening showing a limited hand with five hearts and exactly four spades.

A notrump response structure where responder can transfer into hearts, spades, clubs, or diamonds after a 1NT opening.

A responder rebid that uses the remaining unbid suit as an artificial probe when the best contract is still unclear.

An opening 3NT treatment built around a running minor suit, leaving responder to judge notrump versus an escape.

A 4C ace-asking bid, most commonly used in notrump auctions where 4NT would be natural or quantitative.

An artificial competitive 2NT that separates weak competitive hands from direct constructive three-level bids.

A game try after a single major raise, asking partner whether their holding in a side suit is useful for game.

A minor-raise agreement that gives the slower two-level raise to constructive hands and the jump raise to weak obstructive hands.

A forcing major-suit raise where responder bids 2NT over a one-level major opening to show game-forcing support.

Transfer responses to notrump openings that let responder show a long major while making opener declare the contract.

An artificial 2NT raise after partner opens a major and the next hand doubles, showing limit-raise or better support.

A space-saving key-card ask where the bid one step above four of the agreed trump suit replaces 4NT.

A strong 2C add-on where opener rebids 2H as a relay to 2S, showing either a very strong balanced hand or a genuine heart suit without jumping to 3NT.

A low-memory notrump defense where the 2C overcall is reserved for hands with both majors.

A strong two-suited method over preempts, using leaps and cue bids to show a minor-major hand or both majors.

A 2NT relay used in several competitive auctions to separate weak hands from stronger hands while preserving room.

A double of an opposing slam that asks partner for an unusual lead, often to find a ruff.

A cooperative double used as a game try when the opponents' bidding has taken away all the game-try space below three of the partnership's major.

A direct cuebid over an opponent's opening bid showing a two-suited overcall, usually with at least five cards in each suit.

A minor-suit key-card ask where four of the agreed minor replaces 4NT, preserving space for minor-suit slams.

A compact defense to an opponent’s 1NT opening, using 2C for both majors, 2D for a one-suited major, and major bids for major-plus-minor hands.

An artificial 2D opening that usually shows a weak two in either major, with optional strong variants depending on partnership agreement.

A four-level opening structure where 4C and 4D show strong, long-major openings.

A responder double after partner opens one of a suit and the next hand overcalls, usually showing values and one or both unbid suits.

A conventional new-minor bid after opener rebids 1NT, asking opener for delayed major support or extra shape.

An artificial 2NT inquiry after partner opens a weak two, asking opener to describe hand strength and suit quality.

A Stayman variant that asks opener about five-card majors as well as four-card major holdings, commonly after 2NT.

An artificial 1NT overcall showing a two-suited hand, usually a four-card major plus a longer unbid minor.

A competitive double that keeps the search for a fit alive after partner has acted and the opponents have raised.

A modern Blackwood variant that asks for five key cards: the four aces plus the king of the agreed trump suit.

A transfer-based method after opponents interfere over 1NT, giving responder room to compete, invite, or force to game.

A 1NT overcall in the sandwich position after both opponents have bid, commonly showing the two unbid suits.

An artificial 3NT in major-suit game-forcing auctions that separates serious slam interest from courtesy control bidding.

A notrump convention for strong 5-4 major hands that starts with Stayman and then shows the major pattern after opener denies a major.

A double-jump response or rebid showing at least four-card trump support, game-forcing values, and shortness in the bid suit.

A 2C response to 1NT asking opener for a four-card major, usually looking for a 4-4 major-suit fit.

A competitive agreement where opener uses double or redouble to clarify three-card support for responder’s major.

A double of an opponent’s opening bid that asks partner to choose a suit, usually showing opening values and support for the unbid suits.

Four-level transfers after notrump openings that place the contract in game while making the notrump opener declarer.

A checkback structure after opener rebids 1NT, splitting invitational hands through 2C and game-forcing hands through 2D.

A jump overcall of 2NT showing a two-suited hand, usually the two lowest unbid suits.

A defense to two-suited overcalls, using cue bids and natural bids to separate raises, forcing hands, and competitive actions.

A preemptive two-level opening showing a weak hand with a long suit, most commonly a six-card major.

A 3C relay after opener rebids a strong 2NT, allowing responder to escape into a suit below game.

A responder rebid structure after three one-level partnership bids, using 2C and 2D to separate invitational and game-forcing hands.