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 diagram even then the players' seats are often rotated to follow this convention. The diagram may include additional information such as deal or board number, scoring method (Matchpoints, IMPs, etc.), the final contract, vulnerability and the opening lead. Diagram variants may leave out one or more hands if irrelevant to the presentation. Partially played hands may be displayed to illustrate end-position play. Contract bridge diagram The diagram is typical of that used to illustrate a deal of 52 cards in four hands in the game of contract bridge. Each hand is designated by a point on the compass and so North-South