<P> Table tennis regulations allow different surfaces on each side of the racket . Various types of surfaces provide various levels of spin or speed, and in some cases they nullify spin . For example, a player may have a rubber that provides much spin on one side of their racket, and one that provides no spin on the other . By flipping the racket in play, different types of returns are possible . To help a player distinguish between the rubber used by his opposing player, international rules specify that one side must be red while the other side must be black . The player has the right to inspect their opponent's racket before a match to see the type of rubber used and what colour it is . Despite high speed play and rapid exchanges, a player can see clearly what side of the racket was used to hit the ball . Current rules state that, unless damaged in play, the racket cannot be exchanged for another racket at any time during a match . </P> <P> According to ITTF rule 2.13. 1, the first service is decided by lot, normally a coin toss . It is also common for one player (or the umpire / scorer) to hide the ball in one or the other hand, usually hidden under the table, allowing the other player to guess which hand the ball is in . The correct or incorrect guess gives the "winner" the option to choose to serve, receive, or to choose which side of the table to use . (A common but non-sanctioned method is for the players to play the ball back and forth three times and then play out the point . This is commonly referred to as "serve to play", "rally to serve", "play for serve", or "volley for serve".) </P> <P> In game play, the player serving the ball commences a play . The server first stands with the ball held on the open palm of the hand not carrying the paddle, called the freehand, and tosses the ball directly upward without spin, at least 16 cm (6.3 in) high . The server strikes the ball with the racket on the ball's descent so that it touches first his court and then touches directly the receiver's court without touching the net assembly . In casual games, many players do not toss the ball upward; however, this is technically illegal and can give the serving player an unfair advantage . </P> <P> The ball must remain behind the endline and above the upper surface of the table, known as the playing surface, at all times during the service . The server cannot use his / her body or clothing to obstruct sight of the ball; the opponent and the umpire must have a clear view of the ball at all times . If the umpire is doubtful of the legality of a service they may first interrupt play and give a warning to the server . If the serve is a clear failure or is doubted again by the umpire after the warning, the receiver scores a point . </P>

How many types of serves in table tennis
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