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7. There is a substantial range in the size and significance of Tournaments. You should not simply consider the real size of the pool table additionally the required playing space around the table. For example, they play snooker on a pool table, where a professional table measures seven feet long and 3.5 feet wide. A ball is also considered driven off the table if it would have been driven off the table except for striking an object such as a light fixture, piece of chalk or a player which causes it to return to the table. A scoop shot, in which the cue tip contacts the playing surface and the cue ball at the same time and this causes the cue ball to rise off the cloth, what is billiards is treated like a miscue. The object balls are struck by the cue ball with the usual intent of driving them into pockets. Usually a legal jump shot is played by elevating the cue stick and driving the cue ball down into the playing surface from which it rebounds. The cue ball is the ball that is struck by the shooter at the beginning of a shot. A shot is said to be a safety shot if the game in play is a call shot game and the shooter declared the shot to the referee or his opponent to be a "safety" before the shot.

The shooter, after the break at any time may call "safety" which permits him to make contact with the legal object ball without pocketing a ball and end his inning. Ten ball is a call shot game played with ten object balls numbered one through ten and the cue ball. It happens when the object balls have been racked and the cue ball is played from behind the head string usually with the intent of breaking the rack apart. The rack is the framing device, typically triangular, used to arrange the object balls for the break shot at the start of the game. A ball touching a rail at the start of a shot (said to be "frozen" to the rail) is not considered driven to that rail unless it leaves the rail and returns. A ball that contacts the top of the rail is not considered to have been driven off the table if it returns to the playing surface or enters a pocket. The position of a ball is determined by the projection of its center vertically downward onto the playing surface. The referee will replace the balls to their original position as accurately as possible. If the cue ball contacts an already pocketed ball, the cue ball will be considered pocketed whether it rebounds from the pocket or not.

Although some miscues involve contact of the side of the cue stick with the cue ball, unless such contact is clearly visible, it is assumed not to have occurred. Some games, such as nine ball, are scored at one point per rack. In some games, object balls are required to be placed on the playing surface other than when forming a new rack. An object ball that rebounds from a pocket back onto the playing surface is not a pocketed ball. If a ball stops near the edge of a pocket, and remains apparently motionless for five seconds, it is not considered pocketed if it later falls into the pocket by itself. During that five second period, the referee should ensure that no other shot is taken. The referee will remove pocketed object balls from full or nearly full pockets, but it is the shooter’s responsibility to see that this duty is performed.

Some players will purchase spot stickers and use them to mark out where the colored balls should go. 34. A Tournament Organiser who has been granted provisional sanctioning shall not use the words "sanctioned by the WPA" or words to that effect and shall not use the WPA logo or other trademarks. It is traditionally white, but may be marked by a logo or spots. In some games a player may choose not to come to the table in certain situations when play would normally pass to him, and then the player remaining at the table continues the inning (e.g. a push-out at nine ball). If the ten ball is pocketed on a legal break shot, it will be re-spotted and the player continues with his inning. They are said to be re-spotted when they are so placed. In addition, the level of competition may be considered since players at the top levels can be expected to be fully familiar with the rules and regulations, while relative beginners may be unfamiliar with how the rules are normally applied. In addition, these material properties will provide various advantages to pool balls, like toughness, durability, balance, predetermined shots, and many more.