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
Billiard ball cue ball. "(See snooker for more information on ball setup.)" The colour balls are sometimes numbered American-style, with their point values, for the amateur/home market, as follows in the adjacent table. Snooker balls are technically standardized at in diameter within a tolerance of plus or minus . No standard weight is defined, but all balls in the set must be the same weight within a tolerance of . However, many sets are actually , even from major manufacturers. Snooker sets are also available with considerably smaller-than-regulation balls (and even with ten instead of fifteen reds) for play on smaller tables