<Li> Players must hit the ball in turn . For example, if A is paired with B, X is paired with Y, A is the server and X is the receiver . The order of play shall be A → X → B → Y . The rally proceeds this way until one side fails to make a legal return and the other side scores . </Li> <Li> At each change of service, the previous receiver shall become the server and the partner of the previous server shall become the receiver . For example, if the previous order of play is A → X → B → Y, the order becomes X → B → Y → A after the change of service . </Li> <Li> In the second or the latter games of a match, the game begins in reverse order of play . For example, if the order of play is A → X → B → Y at beginning of the first game, the order begins with X → A → Y → B or Y → B → X → A in the second game depending on either X or Y being chosen as the first server of the game . That means the first receiver of the game is the player who served to the first server of the game in the preceding game . In each game of a doubles match, the pair having the right to serve first shall choose which of them will do so . The receiving pair, however, can only choose in the first game of the match . </Li> <Li> When a pair reaches 5 points in the final game, the pairs must switch ends of the table and change the receiver to reverse the order of play . For example, when the last order of play before a pair score 5 points in the final game is A → X → B → Y, the order after change shall be A → Y → B → X if A still has the second serve . Otherwise, X is the next server and the order becomes X → A → Y → B . </Li>

Where did the name ping pong come from