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
500 (card game) double misère a set always occurs at 3 tricks. Breach indicates that a non-bidding team intends to breach the contract of a bidding team by at least one more trick than is actually necessary to break the contract. As opposed to the Setting rule, Breach must be called on a per hand basis, and does result in additional scoring. Typically, Breach is not played in a game when the setting rule is being used. A single player from a non-bidding partnership may call to breach another team’s contract after a successful bid for a seven-trick (or more) contract has been