women's volleyball (men's volleyball remained at 30 for another three years, switching to 25 in 2011). If a fifth (deciding) set is reached, the minimum required score remains at 15. In addition, the word "game" is now referred to as "set". The Official Volleyball Rules are prepared and updated every few years by the FIVB's Rules of the Game and Refereeing Commission. The latest edition is usually available on the FIVB's website. Skills Competitive teams master six basic skills: serve, pass, set, attack, block and dig. Each of these skills comprises a number of specific techniques that have been introduced over the years and are now considered standard practice in high-level volleyball. Serve A player stands behind the inline and serves the ball, in an attempt to drive it into the opponent's court. The main objective is to make it land inside the court; it is also desirable to set the ball's direction, speed and acceleration so that it becomes difficult for the receiver to handle it properly. A serve is called an "ace" when the ball lands directly onto the court or travels outside the court after being touched by an opponent; when the only player on the server's team to touch the ball is the server. In contemporary volleyball, many types of serves are employed: Underhand: a serve in which the player strikes the ball below the waist instead of tossing it up and striking it with an overhand throwing motion. Underhand serves are considered very easy to receive and are rarely employed in high-level competitions. Sky ball serve: a specific type of underhand serve occasionally used in beach volleyball, where the ball is hit so high it comes down almost in a straight line. This serve was invented and employed almost exclusively by the Brazilian team in the early 1980s and is now considered outdated. During the 2016 Olympic Games in Rio de Janeiro, however, the sky ball serve was extensively played by Italian beach volleyball player Adrian Carambula. In Brazil, this serve is called Jornada nas Estrelas (Star Trek). Topspin: an overhand serve where the player tosses the ball high and hits it with a wrist snap, giving it topspin which causes it to drop faster than it would otherwise and helps maintain a straight flight path. Topspin serves are generally hit hard and aimed at a specific returner or part of the court. Standing topspin