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The game is divided into four quarters, each of seven minutes. The game clock is stopped when the ball is not 'in play' e.g. between a foul being committed and the free throw being taken and between a goal being scored and the re-start. This causes the average quarter to last around 12 minutes 'real time'. A team may not have possession of the ball for longer than 35 seconds without shooting for the goal or an opponent being ejected - after this time, possession passes to the other team. However if a team shoots the ball within the alloted 35 seconds, and regains control of the ball, the shot clock is reset to 35 seconds.
Dimensions of the water polo pool are not fixed and can vary between 20 x 10 and 30 x 20 metres, and are filled with water to a minimum depth of at least 1.8 metres. The goals are 3 metres wide and 1 meter high. The ball used is a water polo ball. One player on each team is designated the goalkeeper, and their primary job is to guard the goals, deflecting or catching any shots at goal. The goalkeeper is the only player who can touch the ball with both hands at any time, and the only player allowed to stand on the bottom (if the pool is shallow enough to allow this).
Players can move the ball by throwing it to a teammate or swimming whilst pushing the ball in front of them. Players are not permitted to push the ball underwater when being tackled, or push or hold an opposition player unless that player is holding the ball. Water polo players tend to need remarkable stamina due to the considerable amount of holding and pushing that occurs during the game, both that which is unseen/ignored by the referees and that which is allowed. Water polo is one of the most physically demanding of all sports.
As in ice hockey, players can be sent out for short periods of time for committing fouls. In waterpolo, a player caught committing a bad foul, is sent out for 20 seconds, until the next goal, or until his team re-gains possession, whichever comes first. If the foul is a non-sportsman like act however it is considered an act of brutality and will result in the player being ejected for the remainder of the game. During a 'man-up' situation resulting from a foul, the attacking team can expect to score, by adopting a 4-2 formation, and moving the goalkeeper out of position. A player that has been sent out three times must sit out the whole match.
At long range from the goals, shots at goal are usually easy for goalkeepers to stop, but from closer in are very difficult.
There are six field player positions, however unlike most common team sports there is no positional play, players often will play several positions throughout the game as situations demand.
There are standard offensive and defensive positions that act as a guideline for players, the most basic positional set up is known as a 3-3, due to the fact that there are two lines both containing 3 players.
Key positions offensively include: 1 hole set player, 2 wing players, 2 drivers, and 1 point man.
The Hole Set is the center player for the line closest to the opposing teams goal. This player sets up in front of the opposing teams goalie and usually scores the most individually or contributes most often to initiating plays.
The four wing players often swim the most and interchange their positions several times during a single offensive play. They contribute to the actual execution of plays, and most often cumulatively score the most points for any team.
The point player is very similar to a wing player. The position of the player at the top gives more access to providing a better pass to teammates.
Defensive positions are often the same, but just switched from offense to defense. Defense can be played person to person or zone.
The goalkeeper is the only player given several privileges above that of the other players. Only the goalie can touch the ball with two hands. A goalie sometimes counter-attacks by blocking a shot, gaining control of the ball, and making a field pass to a teammate at the opposite end of the pool. This is known in some parts of the world as "cherry picking."