The officiating team consists of one umpire, two or more line referees and a scorer. When the umpire calls "play", if a team refuses to play it forfeits the match. The umpire is the sole judge on the fairness of a play, weather and lighting conditions. His decisions are final. It is the umpire's responsibility to call "fault" or "let", with (or without) an appeal from the players. If an umpire erroneously calls "fault" and immediately corrects himself and calls "play" but the striker fails to return the ball, a "let" is allowed. Umpires serve for an entire match, unless a change is authorized by the tournament committee. Each of the two (or more) line referees is responsible for one boundary line and one half of the side line opposite the umpire, in addition to any other duties assigned by the umpire. Referees signal the umpire in a code prescribed by the BFF. The scorer records the points scored and the number of hands on the score sheet. A ball may be replaced by an umpire if it is lost or damaged. The umpire can overrule a line referee's decision, if he feels that an error has been committed.