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 parts of European Istanbul, where they apparently crossed every day to go to a coffeehouse to play cards." Bridge is a four-player partnership trick-taking game with thirteen tricks per deal. The dominant variations of the game are rubber bridge, more common in social play; and duplicate bridge, which enables comparative scoring in tournament play. Each player is dealt thirteen cards from a standard 52-card deck. A starts when a player leads, i.e. plays the first card. The leader to the first trick is determined by the auction; the leader to each subsequent trick is the player who won the preceding