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
Rules of snooker cannot snooker another red when red is on). The only exception to this is when there are only two balls remaining on the table, namely pink and black. If the opposition somehow fouled trying to pot pink, and illegitimately snookered the striker with the black, then it is fair for the striker to snooker the opposition "back" with the free black ball. A free ball scenario does not occur when the ball gets stuck at the edge of a pocket jaw (commonly referred to as "angled') in such a manner that the player is unable to hit any ball on.