Each player takes turns hitting a ball onto the front wall within the large area defined by the red line at the top of the court (out of court line) and the red line marking the top of the ‘tin’ at the bottom of the front wall.
A rally begins when the server, standing in one of the service boxes, hits the ball directly onto the front wall to rebound in the opposite half of the court behind the ‘short’ line.
Every service ball must strike the front wall first between the out-of-court line and the centre (service) line.
The server must have one foot entirely within either the left or right service box when serving the ball into play.
The service ball must land (after striking the front wall first) in the quarter court, opposite the box from which it was served, on the full.
During the rally the ball must hit the wall between the out-of-court line and the bottom line (tin).
The player receiving the ball can choose to hit the ball before it bounces, but must hit the ball before it has bounced twice on the floor.
If the ball hits the out line, the tin or the floor before reaching the front wall, the point is lost.
Most of the rules of Doubles Squash are the same as the rules in Singles. The matches are played 'point-a-serve' with the players on a team alternating serve until they lose a rally.
Matches are either best of three or best of five games with each game won by the first side to reach 15 points.
Unlike in singles, points are lost when players hit the ball into their team-mates or when a player drops his racquet. Either player of the striking side can return to hit the ball until one side fails to make a good return.
A match consists of three or five games, each game scoring to nine points.
The first player to reach nine points wins the game.
A point can only be won by the server and changeover of service occurs when the server loses the service or subsequent rally.
There are rules governing the size and composition of squash racquets. Many racquets are now made of composite materials or metals with synthetic strings, and are 70 cm long with a strung area of 500 square centimetres.
The speed and amount of bounce of a squash ball is indicated by the colour of the dot on the ball. Elite players use balls with yellow dots, which have extremely low bounce.
In order to prevent serious eye injuries, it is recommended that players wear eye protection that complies with the current Australian Standard.