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
Design for Bidding Design for Bidding Design for Bidding is a book by the Russian-born English bridge player S. J. "Skid" Simon, published posthumously in 1949. It is about the theory of bidding in contract bridge, particularly in the context of the Acol system of which Simon was one of the co-developers. It was the first, and , remains one of the few, studies of the thought processes involved in designing a bidding system, rather than simply setting out the author's conclusions. "Design for Bidding" is described as "the best thing he [Simon] has done on bridge", lofty praise considering the recognition given