Laws of cricket

The game is played in accordance with 42 laws, which have been developed by the Marylebone Cricket Club in discussion with the main cricketing nations. Teams may agree before a game to introduce other rules or alter some of the existing rules. In particular, there are a number of modifications to rules dictating fielding positions for professional limited overs matches.

Players and officials

Players

A team consists of eleven players. Depending on his or her primary skills, a player may be classified as a specialist batsman or bowler. A balanced team usually has five or six specialist batsmen and four or five specialist bowlers. Teams nearly always include a specialist wicket-keeper because of the importance of this fielding position. Each team is headed by a captain, who is responsible for making tactical decisions such as determining the batting order, the placement of fielders and the rotation of bowlers.

A player who excels in both batting and bowling is known as an all-rounder. One who excels as a batsman and wicket-keeper is known as a "wicket-keeper/batsman", sometimes regarded as a type of all-rounder. True all-rounders are rare; most players focus on either batting or bowling skills.

Umpires

Two on-field umpires preside over a match. One umpire stands behind the bowler's wicket, and adjudicates on most decisions. The other (the "square leg umpire") stands with a side view of the batsman (usually near the fielding position called square leg), and assists in decisions for which he or she has a better view. In some professional matches the facility exists for them to refer some decisions to a third umpire, who has the assistance of television replays. In international matches a match referee ensures that play is within the laws of cricket and the spirit of the game. The third umpire and referee do not take the field during play.

Scorers

Two scorers are appointed; usually, one is provided by each team. The laws of cricket specify that the official scorers are to record all runs scored, wickets taken and (where appropriate) overs bowled. They are to acknowledge signals from the umpires, and to check the accuracy of the score regularly both with each other and, at playing intervals, with the umpires. In practice scorers also keep track of other matters, such as bowlers' analyses, the rate at which the teams bowl their overs, and team statistics such as averages and records. In international and national cricket competitions, the media often require notification of records and statistics, so unofficial scorers often keep tally for broadcast commentators and newspaper journalists. The official scorers occasionally make mistakes, but unlike umpires' mistakes these can be corrected after the event.