Contract bridge grand slam exists. The modern game of contract bridge was the result of innovations to the scoring of auction bridge by Harold Stirling Vanderbilt and others. The most significant change was that only the tricks contracted for were scored below the line toward game or a slam bonus, a change that resulted in bidding becoming much more challenging and interesting. Also new was the concept of "vulnerability", making sacrifices to protect the lead in a rubber more expensive. The various scores were adjusted to produce a more balanced and interesting game. Vanderbilt set out his rules in 1925, and within
History of contract bridge supplanted other forms of the game that "bridge" became synonymous with "contract bridge." Led by Ely Culbertson, contract bridge enjoyed a boom in popularity in the US and the UK in the 1930s. In the US and Australia today, bridge is usually "duplicate bridge" played at clubs, at tournaments, and online. In the UK, bridge is still widely played in private homes (rubber or Chicago) as well as at clubs (duplicate and rubber) and tournaments (duplicate). History of contract bridge The history of contract bridge, one of the world's most popular partnership card games, may be dated from the early