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positions around the attacker to dig up any ball that deflects off the block back
into their own court. Popular formations include the 2-3 system and the 1-2-2
system. In lieu of a system, some teams just use a random coverage with the
players nearest the hitter. Defensive systems are the formations used by the
defense to protect against the ball being grounded into their court by the
opposing team. The system will outline which players are responsible for which
areas of the court depending on where the opposing team is attacking from.
Popular systems include the 6-Up, 6-Back-Deep, and 6-Back-Slide defense. There
are also several different blocking schemes teams can employ to disrupt the
opposing teams offense. Some teams, when they are ready to serve, will line up
their other five players in a screen to obscure the view of the receiving team.
This action is only illegal if the server makes use of the screen, so the call is made
at the referees discretion as to the impact the screen made on the receivers
ability to pass the ball. The most common style of screening involves a W
formation designed to take up as much horizontal space as possible.
https://en.wikipedia.org/wiki/Volleyball
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