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
Card reading (bridge) Card reading (bridge) In contract bridge, card reading (or counting the hand) is the process of inferring which remaining cards are held by each opponent. The reading is based on information gained in the bidding and the play to previous tricks. The technique is used by the declarer and defenders primarily to determine the probable suit distribution and card holdings of each unseen ; determination of the location of specific spot-cards may be critical as well. Card reading is based on the fact that there are thirteen cards in each of four suits and thirteen cards in each of four