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The Grand Slam Force is a bidding convention in contract bridge that was developed by Ely Culbertson in 1936. [1] 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.
Suppose East is known to have 7 spades from the bidding and after seeing dummy you deduce West to hold 2 spades; then if your two lines of play are to hope either for diamonds 5-3 or clubs 4-2, the a priori probabilities are 47% and 48% respectively but (,,,) % and (,,,) % so now the club line is significantly better than the diamond line.
In the Swiss convention, in response to an opening 1 ♥ or 1 ♠, a bid of 4 ♣ or 4 ♦ shows four-card support for partner's suit, about 13–15 points, and two or three aces respectively. Alternatively, the bids of 4 ♣ and 4 ♦ can be used to show trump quality; the specific meaning of the two bids varies between partnerships.
A bid of 1 ♥ or 1 ♠ shows at least 4 or 5 cards in the major suit, and 1 ♣ or 1 ♦ shows at least 3 or 4 cards in the minor suit. The complete hand usually contains about (11)12-20(22) high card points. As between two major suits or between two minor suits, the bidder opens in the longer suit; with equal lengths, the higher ranking suit ...
In the partnership card game contract bridge, the Blackwood convention is a bidding convention developed by Easley Blackwood in 1933 [1] and still widely used in the modern game. Its purpose is to enable the partnership to explore its possession of aces, kings and in some variants, the queen of trumps to judge whether a slam would be a feasible ...
Diagrams are used to illustrate a deal of 52 cards in four hands in the game of contract bridge. [1] Each hand is designated by a point on the compass and so North–South are partners against East–West. Suit features include: Each line represents a suit, indicated by its symbol – ♠ for spades, ♥ for hearts, ♦ for diamonds, and ♣ ...
If the N-S diamonds were divided 4-2 instead of 5-1, with clubs consequently divided 3-3, the available total tricks would be only 8 for N-S + 8 for E-W = 16 If, on the other hand, the E-W spades were divided 3-1 instead of 2-2 (with appropriate minor-suit rearrangement), they could make 2 ♥ , while N-S could still make 4 ♠ , giving 18 ...
The book is aimed at beginners, with each chapter outlining a single convention, including takeout doubles, negative doubles, and cuebid raises. [1] All chapters are followed by a quiz. Since its publication, the book has sold over 300,000 copies, [2] and won the American Bridge Teachers' Association Book of the Year (Student) award. [3]
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