Blackball (pool) number "8" (a holdover from kelly pool), though numberless variants are not unknown. British pool tables come in 6 × 3 foot (1.8 × 0.9 m) or 7 × 3.5 ft (2.12 × 1.06 m) varieties, with 7 feet being the regulation size for league play. The table has pockets just larger than the balls and rounded, as in the game of snooker, whereas the international-style (or "American-style") table has pockets significantly wider, with pointed . Tournament rules may require the presence of more than one type of (mechanical bridge), as in snooker. There are two competing standards bodies that
Russian pyramid Russian pyramid Russian pyramid, also known as Russian billiard (, , ) or simply billiards in Russia and Ukraine, is a pocket billiards game, played on a table similar to a snooker table with narrow pockets. It is popular across Eastern Europe as well as countries of the former Soviet Union/Eastern Bloc. A variant with colored balls modeled on those of pool is known as Russian pool. Another variant, , is popular in Finland. In Western countries, the game is known as pyramid billiards. Russian pyramid is considered to be one of the most difficult billiards games. There are several