Billiard table all six pockets), with rounded entrances and nearly parallel sides, like those on a snooker table. One tactical consequence of this design difference is that the jaws of the WPA-type pocket are often used exactly like a horizontal version of the backboard of a basketball goal, to rebound the ball into the pocket; this technique does not work on blackball tables, and even shots down the cushion into a corner pocket are more difficult. For tournament competition under WPA world-standardized rules (and league play under derived rulesets), the bed of the pocket billiard table must be made of slate no
Snooker who played. In 1959, Davis introduced a variation of the game known as "snooker plus" (see the "Variations" section below) to try to improve the game's popularity by adding two extra colours, but it never caught on. A major advance occurred in 1969, when David Attenborough commissioned the snooker television series "Pot Black" to demonstrate the potential of colour television with the green table and multi-coloured balls being ideal for showing off the advantages of colour broadcasting. The series became a ratings success and was for a time the second-most popular show on BBC Two. Interest in the game increased