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
Contract bridge published by the American Contract Bridge League. The majority of rules mirror those of duplicate bridge in the bidding and play and differ primarily in procedures for dealing and scoring. In 2001, the WBF promulgated a set of Laws for online play. Bridge is a member of the family of trick-taking games and is a development of Whist, which had become the dominant such game and enjoyed a loyal following for centuries. According to the "Oxford English Dictionary", "Bridge" is the English pronunciation of a game called "Biritch", which was also known as Russian Whist. However, the idea of a