Contract bridge awards a bonus for holding a certain combination of high cards), although some are common between the two. A larger bonus is awarded if the declaring side makes a small slam or grand slam, a contract of 12 or 13 tricks respectively. If the declaring side is not vulnerable, a small slam gets 500 points, and a grand slam 1000 points. If the declaring side is vulnerable, a small slam is 750 points and a grand slam is 1,500. In rubber bridge, the rubber finishes when a partnership has won two games, but the partnership receiving the most "overall" points
The Bridge World the magazine has periodically polled experts on various bidding treatments and conventions in order to develop a unified system of bidding known as Bridge World Standard. There have been five versions of the system with the latest revision being the 2017 edition. Bridge World Standard has evolved with the practices of North American experts and, similar to the Standard American Yellow Card system promulgated by the American Contract Bridge League, is offered as a system "for use by impromptu or casual partnerships, and as a basis for discussion by those who wish to formulate their own system." The Bridge World