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The Official Encyclopedia of Bridge indicates the best line of play in contract bridge for a single suit in isolation in which declarer and dummy lack the king and ten but possess the ace, queen and jack. The line of play varies depending on how many cards are held by the defence, and the required minimum number of tricks. The probability of success is also shown.
Contract bridge, or simply bridge, is a trick-taking card game using a standard 52-card deck. In its basic format, it is played by four players in two competing partnerships, with partners sitting opposite each other around a table. Millions of people play bridge worldwide in clubs, tournaments, online and with friends at home, making it one of the world's most popular card games, particularly among seniors. The World Bridge Federation (WBF) is the governing body for international competitive bridge, with numerous other bodies governing bridge at the regional level.
A trick-taking game is a card or tile-based game in which play of a hand centers on a series of finite rounds or units of play, called tricks, which are each evaluated to determine a winner or taker of that trick. The object of such games then may be closely tied to the number of tricks taken, as in plain-trick games such as Whist, Contract bridge, Spades, Napoleon, Euchre, Rowboat, Clubs and Spoil Five, or to the value of the cards contained in taken tricks, as in point-trick games such as Pinochle, the Tarot family, Mariage, Rook, All Fours, Manille, Briscola, and most evasion games like Hearts. The domino game Texas 42 is an example of a trick-taking game that is not a card game. Trick-and-draw games are trick-taking games in which the players can fill up their hands after each trick. In most variants, players are free to play any card into a trick in the first phase of the game, but must follow suit as soon as the stock is depleted. Trick-avoidance games like Reversis or Polignac are those in which the aim is to is avoid taking some or all tricks.
The combinations considered by the Official Encyclopedia of Bridge (6th edition) include holdings of 5, 6, 7, 8, 9, 10 and 11 cards by declarerer and dummy; allow for the loss of no tricks or one (more in a few combinations); give the percentage chance of achieving the target number of tricks; and shows the average tricks per deal. The line of play recommended by the Official Encyclopedia of Bridge varies from finessing the nine or the queen to playing for the drop of the king.
In contract bridge and similar games, a finesse is a card play technique which will enable a player to win an additional trick or tricks should there be a favorable position of one or more cards in the hands of the opponents.