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In nine-ball, the basic principles are the same as detailed in the eight-ball section above, but only balls 1 through 9 are used; the 1 ball is always placed at the rack's apex (because in nine-ball every legal shot, including the break, must strike the lowest numbered ball first) over the table's foot spot, and the 9 ball is placed in the center of the rack. Subroutine parameters also were an important step toward structured programming in Basic. Ada, Universal Programming Language: named in honour to Lady Ada Augusta Countess of Lovelace, who in 1843 suggested ideas about programming the Analytic Calculator of Charles Babbage. 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". 202 officially confirmed maximum breaks achieved in professional competition. A maximum break in snooker is achieved by potting all reds with blacks, then potting all six colours, yielding 147 points; this is often known as a "147" or a "maximum". If a player is awarded a free ball with all 15 red balls still in play, they can potentially make a break exceeding 147, with the highest possible being a 155 break, achieved by nominating the free ball as an extra red, then potting the black as the additional colour after potting the free-ball red, followed by the 15 reds with blacks, and finally the colours.

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 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. 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. At the start of a frame, the object balls are positioned on the table as shown in illustration A. Starting with the cue ball in the "D", the first player executes a break-off shot by striking the cue ball with the tip of their cue, aiming to hit any of the red balls in the triangular pack.

At the start of the game, the red balls are racked into a tightly packed equilateral triangle and the six colours are positioned at designated spots on the table. The latter is a common foul committed when a player fails to escape from a "snooker", where the previous player has left the cue ball positioned such that no legal ball can be struck directly in a straight line without being wholly or partially obstructed by an illegal ball. When playing away from a touching ball, the player is not required to strike another object ball. The cue ball may contact an object ball directly or it can be made to bounce off one or more cushions before hitting the required object ball. The game continues until one of the players either pots the black ball to win the frame, or commits a foul (losing the frame). 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 cue ball is placed inside the "D" ready for the break-off shot. The player must then play away from that ball without moving it or else the player will concede penalty points. The player must then pot another red ball followed by another colour. These locks must be picked at both the top and the bottom, sometimes alternating between them. The prize money for professional events increased, with the top players earning several million pounds over the course of their careers. However, lower-ranked professional players struggled to make a living from the sport, especially after paying tournament entry fees, travel, and other expenses. 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. Each segment of the string (bead) represents one point as the players can move one or several beads along the string. We highly recommend not scratching on the break if you can avoid it though, it is a considerable advantage to be the one to break.

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