Editing Squash (sport) (section)

===Interference and obstruction===
Interference and obstruction are an inevitable aspect of squash, since two players are confined within a shared space. Generally, the rules entitle players to a direct straight-line access to the ball, room for a reasonable swing and an unobstructed shot to any part of the front wall. When interference occurs, a player may appeal for a "let" and the referee (or the players themselves if there is no official) then interprets the extent of the interference. The referee may allow a let and the players then replay the point or award a "stroke" to the appealing player (meaning that he is declared the winner of that point) depending on the degree of interference, whether the interfering player made an adequate effort to avoid interfering, and whether the player interfered with was likely to have hit a winning shot had the interference not occurred. An exception occurs when the interfering player is directly in the path of the other player's swing, effectively preventing the swing, in which case a stroke is always awarded.

When it is deemed that there has been little or no interference, the rules provide that no let is to be allowed in the interests of continuity of play and the discouraging of spurious appeals for lets. Because of the subjectivity in interpreting the nature and magnitude of interference, awarding (or withholding) of lets and strokes is often controversial and professional players will get "reviews" where a different referee will review the footage and make a decision. If the review is successful than the player will get their review back but if the review is unsuccessful they lose their review. 

Interference also occurs when a player's shot hits their opponent prior to hitting the front wall. If the ball was travelling towards the side wall when it hit the opponent, or if it had already hit the side wall and was travelling directly to the front wall, it is usually a let. However, it is a stroke to the player who hit the ball if the ball was travelling straight to the front wall when the ball hit the opponent, without having first hit the side wall. Generally, after a player has been hit by the ball, both players stand still; if the struck player is standing directly in front of the player who hit the ball, he loses the stroke; if he is not straight in front, a let is played. If it is deemed that the player who is striking the ball is deliberately trying to hit his opponent, they will lose the stroke. An exception occurs when the player hitting the ball has "turned", i.e., letting the ball pass them on one side, but then hitting it on the other side as it came off the back wall. In these cases, the stroke goes to the player who was hit by the ball.