See R. Byrne, Byrne's Standard Book of Pool and Billiards (1987).
Billiards game played on an oblong table having six pockets with 15 object balls and a white cue ball. At the beginning of play, the balls are arranged (racked) in a pyramid formation with its apex on a spot near the foot of the table. The first player breaks the formation by driving the cue ball into it; to continue play, he or she must hit a ball into a pocket. In the popular “8-ball” game, the first player (or team) to sink either the seven solid-coloured balls (numbered 1–7) or the seven banded (striped) balls (9–15), finishing with the black 8-ball, wins. In “9-ball,” only the balls numbered 1–9 are used, and they must be sunk sequentially; the player who sinks the 9-ball wins. Pool probably reached its present form in England and France by circa 1800; today it is most popular in North America.
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Any of various games played on a cloth-topped, cushion-railed rectangular table by driving small, hard balls against one another or into pockets with a long stick called a cue. Carom, or French billiards, is played with three balls, two white and one red, on a table without pockets. The object is to stroke the white cue ball so that it hits the two object balls in succession, scoring a carom (one point). English billiards is also played with three balls but on a pocketed table; it is scored in various ways. Snooker is another popular British billiards game. The principal billiards game in North America is pocket billiards, or pool. The Billiard Congress of America controls U.S. tournament play, including the U.S. Open Pockets Billiard Championship, regarded as the world championship.
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The pockets are assigned numbers, clockwise starting at the top right corner pocket as viewed from the top (head) of the table, as the 1 hole (or 1 pocket) through 6 hole. The object for each player is to their own object ball in the 1 hole, 2 hole, 3 hole, etc., in ascending order.
The first player places their numbered ball on the . The player may then place the in as in snooker, or on a "D"-less American-style table, in (i.e., behind the ).
The player attempts to pocket his ball in the 1 hole. If they succeed, the object ball is again and they proceed to the next hole, otherwise it is the next shooter's turn, who also shoots the cue ball from the "D" or kitchen at their numbered ball on the foot spot, aiming for the 1 hole. An object ball not pocketed is left on the table.
Once all players have taken their first shot, players shoot with the cue ball wherever it lies after the previous shot. Note that it is possible for the first player to win the game without any other player getting to shoot.
If the player before the incoming shooter committed a , and the new shooter is (does not have a clear shot to his ball), the ball(s) in the way may be temporarily moved so that the shooter has a clear shot. These must be put back after the shot. This rule is highly unusual, perhaps even unique, in the world of cue sports.
The game is won when one player legally pockets his ball into the 6 hole.