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
Singaporean bridge 1, 2, 4, 8, 16, 32, 64 points are scored for contracts of 7, 8, 9, 10, 11, 12, 13 tricks respectively. Both partners score the same points when contract are fulfilled. There is no extra point for over-trick, so players should try to bid to their full potential. There is a penalty for under-trick to prevent reckless pre-emptive bidding; the opponent score 1, 2, 4, 8, 16 points... and so on, depending on the number of under-tricks. The points for each game are recorded on a piece of paper with four columns for four players. In each game only