The cue ball is placed inside the "D" ready for the break-off shot. At the end of each shot, the cue ball remains in the position where it has come to rest (unless it has entered a pocket, where it is returned to the "D") ready for the next shot. If both players agree, the balls are returned to their starting positions and the frame is restarted (known as a "re-rack"), with the same player taking the break-off shot as before. The responsibilities of the referee include announcing the points scored during a break, determining when a foul has been committed and awarding penalty points and free balls accordingly, replacing colours onto their designated spots after they are potted, restoring the balls to their previous positions after the "miss" rule has been invoked (see Scoring), and cleaning the cue ball or any object ball upon request by the striker. If the referee has also called a "miss"-meaning that the referee has deemed the opponent not to have made their best possible attempt to hit the object ball-the player has the option of having the balls replaced to their original positions and forcing the opponent to play the shot again. The World Championship uses a longer format, with matches ranging from the best of 19 frames in the first round to best of 35 for the final, which is played over four sessions of play held over two days.

Some early world finals had much longer matches, such as the 1947 World Snooker Championship, which was played over the best of 145 frames. Most matches in current professional tournaments are played as the best of 7, 9, or 11 frames, with finals usually the best of 17 or 19 frames. Several players, including Ronnie O'Sullivan, Mark Allen and Steve Davis, have claimed that there are too many tournaments in the season, causing burnout of players. Professional snooker players compete on the World Snooker Tour, which is a circuit of world ranking tournaments and invitational events held throughout the snooker season. Snooker accessories include: chalk for the tip of the cue, used to help apply spin on the cue ball; various sorts of rest, such as the swan or spider for playing shots that are difficult to play by hand; extensions for lengthening the cue stick; a triangle for racking the reds; and a scoreboard which is typically attached to a wall near the snooker table. Players will often play on even when there are not enough points available for them to win, hoping to force their opponent into playing foul shots by laying snookers.

Perhaps it reminds them of their first game, an ancestral home, or even their favorite sports team. Even with insulation on the walls, the concrete floor does little to help keep the temperature steady. The process of alternately potting reds and colours continues until the striker fails to pot the desired object ball or commits a foul-at which point the opponent comes to the table to start the next turn-or when there are no red balls remaining. You must be able to determine your finish and start point for using this purpose. Each segment of the string (bead) represents one point as the players can move one or several beads along the string. A simple scoring bead is sometimes used, called a "scoring string" or "scoring wire". Scoring in billiards is based on the specific game variation being played. One game of snooker is called a "frame". Billiards and snooker share similarities but also have distinct differences in terms of table size, rules, and gameplay strategies. Understanding what materials billiards balls are made of enables players to make informed decisions about their equipment choices.

Professional and competitive amateur matches are officiated by a referee, who is charged with ensuring the proper conduct of players and making decisions "in the interests of fair play". All competitions are open to professional players who have qualified for the tour, and selected amateur players, but most events include a separate qualification stage. Breaks of 100 points or more are referred to as a century break, and are recorded over the career of a professional player. Phelan played a crucial role in popularizing the sport in America, while Mosconi dominated the game in the mid-20th century and introduced it to a wider audience. In some game variations, players are required to call the ball and pocket they intend to shoot before executing a shot. These are shots that are designed to make playing a legal shot harder, such as leaving another ball between the cue ball and the object ball. When playing away from a touching ball, the player is not required to strike another object ball.

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