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
Ninety-nine (trick-taking card game) each earns 20 points; if three succeeded, each earns 10 points; and if all four succeeded in a 4-player game there is no bonus. A declaration adds 30 points (to the declarer if successful, to the others if not); a revelation is worth 60 points (to the declarer if successful, to the others if not). Note that in the 3-player game, the maximum score in one round is ninety-nine (hence the name): 9 points for winning all nine tricks, 30 points for bidding 9 tricks and getting them (while no one else got their bid), and 60 points for a