Triple Crown events are valued by many players as the most prestigious. O'Sullivan also holds the record for the most ranking titles (41) and most Triple Crown titles (23) achieved in the sport. He won six world titles (1981, 1983, 1984, and 1987-1989) and competed in the most-watched snooker match, the 1985 World Snooker Championship final, which he lost to Dennis Taylor. Power Snooker was a short-lived cue sport based on aspects of snooker and pool, which was first played competitively as the 2010 Power Snooker Masters Trophy and again in 2011, but the format failed to gain widespread appeal and was discontinued. After the creation of the World Snooker Championship, snooker overcame billiards as the most popular cue sport in the United Kingdom. Despite its name, American snooker is not governed or recognised by the United States Snooker Association, but by the Billiard Congress of America. Snookerpool is a variant of snooker that is played with traditional snooker balls on an American pool table with the larger pockets (11 ft × 5.5 ft or 3.4 m × 1.7 m). American snooker is an amateur version of the game played almost exclusively in the United States. Beginning in the 2014-15 season, some players have also received invitational tour cards in recognition of their outstanding contributions to the sport; these cards are issued at the discretion of the World Snooker Board, and have been awarded to players including Steve Davis, James Wattana, Jimmy White, and Stephen Hendry.

He was only beaten on level terms by his brother Fred Davis, all coming after his retirement from the game. 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. Additionally, "one-year" and "two-year" ranking lists are compiled at the end of every season, after the World Championship; these year-end lists are used for pre-qualification at certain tournaments and for tour-card guarantees. Although some success was achieved with this format, it did not receive the same amount of press attention or status as the regular ranking tournaments. Certain other events, such as those in the Players Series, use the one-year ranking list to qualify; these use the results of the current season to denote participants. This "rolling" list is maintained and updated throughout the season, with points from tournaments played in the current season replacing points earned from the corresponding tournaments of two seasons ago. O'Sullivan played only a subset of tournaments in 2012, so he could spend more time with his children; as a result he ended the 2012-13 season ranked 19th in the world despite being the world champion. 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.

While the main professional tour is open to female players, there is also a separate women's tour organised by World Women's Snooker (formerly the World Ladies Billiards and Snooker Association) that encourages female players to participate in the sport. Snooker is a mixed gender sport that affords men and women the same opportunities to progress at all levels of the game. Tenball was a snooker variant designed specifically for the television show of the same name, presented by Phillip Schofield, which lasted for one series. The amount of this deflection of an object ball from its expected path is increased by several things, including by dirty or pitted balls that briefly grip each other more, by a thick cut-shot angle that provides for extended friction between the balls (cut-induced throw), by slow ball-contact speed (speed-induced throw) for the same reason, by stun shots for the same reason, and by the object ball being impacted by a ball that is rapidly side-spinning (spin- or english-induced throw), which causes the object ball to roll in a curve more toward that throw direction. This Aramith Jim Rempe training cue ball is marked for beginners on one side and more advanced players on another.

At the start of the game, the single red is positioned halfway between the pink ball and the side cushion and the break-off shot cannot be used to pot the red or place the opponent in a snooker. If a player pots the cue ball in a side pocket, the opposing player can place the ball anywhere on the table. In both games, each player shared the same cue ball. This is not the former British Prime Minister of the same name. After the abandonment of the World Championship in 1953, with the 1952 event boycotted by British professionals, the World Professional Match-play Championship became the unofficial world championship. The winner of the World Women's Snooker Championship now receives a two-year tour card to the main professional tour. The Snooker Shoot Out is a variant snooker tournament, first staged in 1990, featuring single-frame matches for an accelerated format. Snooker has faced criticism for matches taking too long.

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