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) the bidding team successfully fulfills its contract, then it receives the full points of the original bid, and the team calling breach loses points. -Lose/Lose: If the bidding team does not fulfill its bid, but the opposing team does not take the necessary number of tricks to perform a breach, then the bidding team loses the point value of the original bid, and the team calling breach loses the predetermined value of the breach call. -Lose/Win: If the bidding team loses its bid by the pre-established number of tricks, then the bidding team loses the contract points, and the team