Most of the rules reflect those of the double bridge in the offer and the game and differ especially in the trading and scoring procedures. At the end of the hand, points are awarded to the explanatory party when they conclude the contract or to the defenders. Partnerships can be vulnerable, which increases the rewards for entering into the contract, but also increases the penalties for undertricks. If a rubber bridge page has earned 100 points from the contract, it has won a match and is vulnerable to the remaining rounds, but for the double bridge, the fault is predetermined based on the number of each card.  In 1925, when the contract bridge first developed, bridge tournaments became popular, but the rules were a bit fluid, and several different organizing bodies were involved in sponsoring the tournament: the American Bridge League (formerly the American Bridge Auction League, which changed its name in 1929), the American Whist League and the United States Bridge Association. The first officially recognized World Cup was played in 1935. However, until 1937, the American Contract Bridge League (ACBL) had come to power (an association of the ABL and USBA) and it remained the sanctioning body for bridge tournaments in North America. The World Bridge Federation (WBF) was established in 1958 to promote bridges around the world, coordinate the regular review of laws (every ten years, next in 2027) and organize world championships.  In addition to the basic rules of the game, there are many additional rules regarding the conditions of play and the correction of irregularities that apply mainly to tournament directors who play the role of referee and who generally control the procedures during competitions. However, several details of the procedure are left to the discretion of the zonal organization of bridges for tournaments under its auspices and some (for example. B the choice of the movement) of the organizing organization (z.B.dem association). At Rubber Bridge, a partnership wins a game as soon as it has accumulated 100 contract points; Excess contract points will not be transferred to the next game.
A two-match winning partnership wins the rubber and gets a bonus of 500 points if opponents have won a match and 700 points if they have not.