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The Laws of Duplicate Bridge (also known as the Laws of Duplicate Contract Bridge and the Laws of Contract Bridge) is the official rule book of duplicate bridge promulgated by the World Bridge Federation (WBF). The first Laws of Duplicate Contract Bridge were published in 1928. [1]
The most relevant change is Law 16C2 [4] (Law 16D2 in the 2007 Laws Of Duplicate Bridge [5]), which defines information gained from either side's legal withdrawal of a card as unauthorized for the offending side. (Note: although the revoking side may correct its revoke, a revoke has nevertheless occurred and therefore there is an "offending ...
The principal difference between the two systems was in hand evaluation: Culbertson used honor tricks to assess a hand's strength whereas Goren used high card points and distribution points. Goulash A style of dealing, usually in rubber and Chicago games, where the cards are not thoroughly shuffled between deals and are dealt in groups.
Level bonus for game and slams: If a deal results in a game contract, slam or grand slam bid and made, level bonus points are recorded above the line and have the same values as in duplicate bridge. Part-score accumulation and level bonus: The part-score treatment differs from that in duplicate bridge and is somewhat akin to that of rubber bridge.
While a deal of bridge is always played following a unique set of rules, its scoring may vary depending on the type of event the deal is played on. There are two main categories of scoring: rubber and duplicate.
The rule can be generalized for all notrump contracts as follows: In a notrump contract, subtract from 'n' the total number of cards that declarer and dummy hold in the defenders' suit and duck their lead of the suit that many times; 'n' is equal to four plus the level of the contract.
The Jacoby transfer, or simply transfers, in the card game contract bridge, is a convention in most bridge bidding systems initiated by responder following partner's notrump opening bid that forces opener to rebid in the suit ranked just above that bid by responder. For example, a response in diamonds forces a rebid in hearts and a response in ...
The principle of restricted choice is a guideline used in card games such as contract bridge to intuit hidden information. It may be stated as "The play of a card which may have been selected as a choice of equal plays increases the chance that the player started with a holding in which his choice was restricted."