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
The Official Encyclopedia of Bridge Bridge" was simple to state: "To provide an official and authoritative answer to any question a reader might ask about the game of contract bridge and its leading players." On its dust jacket, the first edition states: This encyclopedia is the most complete and authoritative book of information, guidance, and instruction for bridge players, ever published. It covers every aspect of bridge in all bridge-playing countries of the world; it contains complete and lucid definitions of every term; it describes and illustrates every standard bid, every recognized convention, and every type of play. The first edition is divided into two