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
Crud (game) the latter, when available) using the cue ball (the "shooter ball"), and one "object ball" (most commonly a striped ball since it is easiest to determine if it is in motion). Only the corner pockets are used on non-snooker or smaller tables. On these, the side pockets (if there are any) are blocked off, traditionally by rolls of toilet paper. Pool cues are not used; the shooter ball is launched across the table surface with the hand. A game of crud involves moving around the table and other players, trying to grab the shooter ball and either strike the object