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
Bidding box deal. The additional (non-call) cards are used as follows: The exact regulations for the use of bidding boxes vary according to the sponsoring authority. In the American Contract Bridge League, for example: Use of bidding boxes greatly improves the game for people with hearing impairment. For tournaments where bidding boxes are not available, sponsoring organizations will allow their use for the tables where they play. In the case of limited availability of the boxes, people with hearing problems will have precedence. Conversely, players with certain physical impairments (blindness, arthritis) may be unable to use bidding boxes and are exempted from