Laws of cricket

The game is played in accordance with 42 laws of cricket, which have been developed by the Marylebone Cricket Club in discussion with the main cricketing nations. Teams may agree to alter some of the rules for particular games.

Other rules supplement the main laws and change them to deal with different circumstances. In particular, there are a number of modifications to the playing structure and fielding position rules that apply to one innings games that are restricted to a set number of fair deliveries.

Umpires

Two on-field umpires preside over a match. One umpire (the field umpire) will stand behind the wicket at the end from which the ball is bowled, and adjudicate on most decisions. The other (the square leg umpire) will stand near the fielding position called square leg, which offers a side view of the batsman, and assist on decisions for which he or she has a better view. In some professional matches, they may refer a decision to an off-field third umpire, who has the assistance of television replays. In international matches an off-field match referee ensures that play is within the laws of cricket and the spirit of the game.

Scorers

Two scorers are appointed, and most often one scorer 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 umpire, 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.

Run scoring

To score a run, a striker must hit the ball and run to the opposite end of the pitch, while his non-striking partner runs to his end. To register a run, both runners must touch the ground behind the popping crease with either their bats or their bodies. If the striker hits the ball well enough, the batsmen may double back to score two or more runs. This is known as running between wickets. However, no rule requires the batsman to run upon striking the ball. If the batsmen score an odd number of runs, then they will have swapped ends and their roles as striker and non-striker will be reversed for the next ball, unless the most recent ball marks the end of an over.

If a fielder knocks the bails off the stumps with the ball while no batsman is grounded behind the nearest popping crease, the nearest batsman is run out. If the ball reaches the boundary, then runs are automatically scored. A ball that goes over the boundary on the full automatically scores six runs. A ball that reaches the boundary after having touched the ground automatically scores four runs. These runs are scored instead of any runs the batsmen may have already run, and they return to the ends they started at, unless the batsmen have already scored more than they would receive for the boundary.

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. Of late, the role of specialist fielder has also become important in a team. Each team is headed by a Captain who is responsible of taking the major decisions in the field.

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 and valuable players; most players focus on either their batting or their bowling.

Placements of players

The team batting always has two batsmen on the field. One batsman, known as the striker, faces and plays the balls bowled by the bowler. His or her partner stands at the bowling end and is known as the non-striker.

The fielding team has all eleven of its players on the ground, and at any particular time, one of these will be the bowler. The player designated as bowler must change after every over. The wicket-keeper, who generally acts in that role for the whole match, stands or crouches behind the wicket at the batting end. The captain of the fielding team spreads his or her remaining nine players — the fielders — around the ground to cover most of the area. Their placement may vary dramatically depending on strategy. Each position on the field has a unique label.