[custom_adv] The games with regulated international professional competition, if not others, have been referred to as "sports" or "sporting" events, not simply "games", since 1893 at the latest. [custom_adv] Quite a variety of particular games (i.e., sets of rules and equipment) are the subject of present-day competition, including many of those already mentioned, with competition being especially broad in nine-ball, snooker, three-cushion and eight-ball. [custom_adv] Snooker, though technically a pocket billiards variant and closely related in its equipment and origin to the game of English billiards, is a professional sport organized at the international level, and its rules bear little resemblance to those of modern pool, pyramid and other such games. [custom_adv] A "Billiards" category encompassing pool, snooker and carom was featured in the 2005 World Games, held in Duisburg, Germany, and the 2006 Asian Games also saw the introduction of a "Cue sports" category. [custom_adv] Russian pyramid and kaisa have a size of 68 mm (2 11⁄16 in). In Russian pyramid there are sixteen balls, as in pool, but fifteen are white and numbered, and the cue ball is usually red.
