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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 Rule of 11 applies when the lead is the 4th best. When following the Rule of 10-12, the lead is the third card from a three or four-card suit and the fifth card from a five-card or longer suit. Leading the third best is also applied to interior sequences (K J 10 x x) which is less ambiguous than the top of interior sequence.
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 increase or decrease in probability is an example of Bayesian updating as evidence accumulates and particular applications of restricted choice are similar to the Monty Hall problem. In many of those situations the rule derived from the principle is to play for split honors. After observing one equivalent card, that is, one should continue ...
The Drury convention is a bridge convention, used to show a game-invitational major suit raise by a passed hand while guarding against a light opening by partner in third or fourth seat. It is initiated by an artificial and forcing 2 ♣ response by the passed hand to a 1 ♥ or 1 ♠ opening by partner.
Example: Suppose declarer (South) leads the Queen of a suit, dummy (North) has the Ace, and the hand in between (West) has the King. If West fails to play the King over the Queen, declarer will allow the Queen to make a trick, and then the Ace will also make a second trick.
N W E S ♠ 4 ♥ 5 3 ♥ 2 ♦ — ♦ 7 3 ♣ 4 ♣ 8 East to lead ♠ K Q 5 ♥ 6 ♦ — ♣ Q Spades are trump. If the declarer were on lead, he could draw trumps and claim the rest of tricks; however, with East on lead, when he leads a diamond, declarer has two unfavorable choices: if he ruffs low, he will get overruffed by West. If he ruffs high (with an honor), the West's spade jack ...
A bridge diagram 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.