World Pool-Billiard Association in the context of "Nine-ball"

The English-originating version of eight-ball pool, also known as English pool, English eight-ball, blackball, or simply reds and yellows, is a pool game played with sixteen balls (a cue ball and fifteen usually unnumbered object balls) on a small pool table with six pockets. It originated in the United Kingdom and is played in the Commonwealth countries such as Australia and South Africa. In the UK and Ireland it is usually called simply "pool".

The English version of eight-ball has two main sets of playing rules used in professional play; those of the World Pool-Billiard Association (WPA), known as "blackball rules", and the code of the World Eightball Pool Federation (WEPF), known as "international rules".

Ten-ball is a rotation pool game similar to nine-ball, but using ten balls instead of nine, and with the 10 ball instead of the 9 as the "money ball".

Although the game has existed since the early 1960s, its popularity has risen since the early 2000s as a result of concerns that nine-ball has suffered as a result of flaws in its fundamental structure, particularly the ease with which players can often make balls from the break. The World Pool-Billiard Association (WPA) standardized rules for ten-ball are very similar to those for nine-ball, but with key changes to increase the difficulty of the game. In contrast to nine-ball, it is slightly harder to pocket any balls on the break shot with the more crowded rack, the initial shooter cannot instantly win the game by pocketing the 10 on the break, all shots must be called, and performing a string of break-and-runs on successive racks is statistically more difficult to achieve.