Indoor games and sports is captured and removed from the board. The object of the game is to trap (checkmate) the enemy king by putting it in a position where it cannot escape capture. Various indoor games, including billiards, snooker and pool, are played on a large, flat, cloth-covered table with six pockets. In these games, each of the two players tries to pot the balls (knock them into the pockets) by striking them with a cue-ball, which is hit with the tip of a stick called a cue. In "billiards", there are just three balls: a white cue-ball for each player and one
English billiards balls (52.5 mm or in with a tolerance of 0.05 mm) and they must weigh the same to a tolerance of 0.5 g within a set. The balls are designated as: The billiard table used has the same dimensions as a snooker table, (and in many venues, both games are played on the same equipment). The playing area of a standard tournament table measures 11 feet 8 inches by 5 ft 10 in (3.569 m by 1.778 m) with a tolerance of inch (1.26 cm) in both directions, though smaller ones, down to half size, are often found in snooker