Pinetree

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Every player on the World Snooker Tour is assigned a position on the WPBSA's official world ranking list, which is used to determine the seedings and the level of qualification each player requires for the tournaments on the professional circuit. Professional snooker players compete on the World Snooker Tour, what is billiards which is a circuit of world ranking tournaments and invitational events held throughout the snooker season. A two-tier structure was adopted for the 1997-98 snooker season; comprising six tournaments known as the WPBSA Minor Tour was open to all professionals, but only ran for one season. The global governing body for professional snooker is the World Professional Billiards and Snooker Association (WPBSA), founded as the Professional Billiard Players' Association. 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. A snooker match generally consists of a predetermined number of frames. The objective of a billiards game is to score a fixed amount of points, or to score the highest number of points within a set time limit that is agreed upon at the beginning of the game. The total number of consecutive points (excluding fouls) that a player amasses during one visit to the table is known as a "break".

The game continues until every red ball has been potted and only the six colours and the cue ball are left on the table. 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 there are not enough points remaining on the table for a player to win the frame, that player may offer to concede the frame while at the table (but not while their opponent is still at the table); a frame concession is a common occurrence in professional snooker. 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. Even putting up insulation on three walls can help keep the area cool in the summer and warm in the winter. The colours must next be potted in the ascending order of their values, from lowest to highest, i.e. yellow first (worth two points), then green (three points), brown (four points), blue (five points), pink (six points), and finally black (seven points); each colour remains in the pocket after being potted.

A yellow and black ball worth ten points was added between the blue and pink, and the game had a slightly revised set of rules. When the final ball is potted, the player with the most points wins the frame. 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 scores are equal when all of the object balls have been potted, the black is used as a tiebreaker. 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. If dissatisfied with the position left after a foul, the next player may nominate the opponent who committed the foul to play again from where the balls have come to rest. Alex Higgins claiming to have made a similar break. A player could achieve a break of 15, for example, by first potting a red followed by a black, then another red followed by a pink, before failing to pot the next red.

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. 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". If the cue ball finishes in contact with an object ball, a touching ball is called. A foul can occur for various reasons, such as sending the cue ball into a pocket, or failing to hit the object ball. 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. There are seven solid-colored balls numbered 1 through 7, seven striped balls numbered 9 through 15, an 8 ball, and a cue ball.