Grand slam force Grand slam force The Grand Slam Force is a bidding convention in contract bridge that was developed by Ely Culbertson in 1936. It is intended to be used in cases where the combined hands of a partnership are so strong that a slam (winning at least 12 tricks) is a near-certainty and a grand slam (winning all 13 tricks) is a possibility. It allows one partner to gain information on the quality of trumps in the other partner's hand. When this convention is in force, a bid of 5NT (five notrump), when it does not conflict with other conventions used
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