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In contract bridge, the Rule of 11 is applied when the opening lead is the fourth best from the defender's suit. [1] By subtracting the rank of the card led from 11, the partner of the opening leader can determine how many cards higher than the card led are held by declarer, dummy and himself; by deduction of those in dummy and in his own hand, he can determine the number in declarer's hand.
The first Laws of Duplicate Contract Bridge were published in 1928. [1] They were revised in 1933, 1935, 1943, 1949, 1963, 1975, 1987, 1997, 2007 and 2017. [2] The Laws are effective worldwide for all duplicate bridge tournaments sponsored by WBF, zonal, national and subordinate organizations (which includes most bridge clubs).
Duplicate bridge is a variation of contract bridge where the same set of bridge deals (i.e., the distribution of the 52 cards among the four hands) are played by different competitors, and scoring is based on relative performance. In this way, every hand, whether strong or weak, is played in competition with others playing identical cards, and ...
The opening lead is the first card played in the playing phase of a contract bridge deal. The defender sitting to the left (LHO) of the declarer is the one who makes the opening lead. The defender sitting to the left (LHO) of the declarer is the one who makes the opening lead.
The principle of restricted choice is a guideline used in card games such as contract bridge to intuit hidden information. It may be stated as "The play of a card which may have been selected as a choice of equal plays increases the chance that the player started with a holding in which his choice was restricted."
The rules of the game and expectations for ethical play are codified in the official Laws of Duplicate Contract Bridge and its published interpretations; the rules define which actions at the table are and are not permitted and remedies for rule infractions and irregularities.
In contract bridge and particularly in duplicate bridge a convention card is a summary of the conventions and treatments that a particular pair is using. [1] The Laws of Duplicate Bridge specify that "Each partnership has a duty to make available its partnership understandings to opponents before commencing play against them."
Forcing, unless the partnership has agreed that this is an exception to the "2/1 rule." 1 ♦ – 2 ♣ Forcing for one round only (as in Standard American), except in the variant of 2/1 where this sequence is game forcing as well. 1 ♣ – 2 ♣ Forcing for one round; 10 points or more with at least four clubs. 1 ♣ – 3 ♣