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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 difference in total points scored by each team is converted to International Match Points (IMPs) using a standard table [2] [12] which has sublinear dependencies on differences to reduce the effect of such large swings. [4] Originally named European Match Points (EMPs), [b] the scale provided for a maximum gain of 12 points as shown in the ...
Rubber Bridge Scoring Above the line In rubber bridge, the location on the scorepad above the main horizontal line where extra points are entered; extra points are those awarded for holding honor cards in trumps, for bonuses for scoring game, small slam, grand slam or winning a rubber, for overtricks on the declaring side and for undertricks on the defending side and for fulfilling doubled or ...
A bid of 1 ♥ or 1 ♠ shows at least 4 or 5 cards in the major suit, and 1 ♣ or 1 ♦ shows at least 3 or 4 cards in the minor suit. The complete hand usually contains about (11)12-20(22) high card points. As between two major suits or between two minor suits, the bidder opens in the longer suit; with equal lengths, the higher ranking suit ...
Also, the specific duplicate scoring method affects the tactics of sacrifice – at matchpoint scoring, −500 or −800 (down three or four) against −620 is a 50/50 probability for a top or bottom score, but at international match points (IMPs) it can gain 3 IMPs (120 difference) but lose 5 (180 difference), making it less attractive.
In auction bridge, bidding beyond winning the auction is pointless; for example, if taking all 13 tricks, there is no difference in score between a 1 ♠ and a 7 ♠ final contract, as the bonus for rubber, small slam or grand slam depends on the number of tricks taken rather than the number of tricks contracted for. [13]
In the American Contract Bridge League (ACBL), the two tables sharing boards are called a "relay" and the stand that holds the boards that are out of play is called a "bye stand." But in the English Bridge Union (EBU), the two tables sharing boards are called a "share" and the stand that holds the boards that are out of play is called a "relay."