Cricket is a team sport for two teams of eleven players each. A formal game of cricket can last anything from an afternoon to several days.
Although the game play and rules are very different, the basic concept of cricket is similar to that of baseball. Teams bat in successive innings and attempt to score runs, while the opposing team fields and attempts to bring an end to the batting team's innings. After each team has batted an equal number of innings (either one or two, depending on conditions chosen before the game), the team with the most runs wins.
Cricket is played in two very distinct forms. The first is limited duration, in which a specific number of hours of playing time are allocated and each team plays two innings.
The second is limited overs, in which each team plays one innings of a pre-determined number of overs.
First class cricket matches are the most prestigious games, played at a professional level. The top level games are international Test matches, played betwen countries. There are also domestic first class cricket competitions. First class matches are of limited duration. Test matches will be described first, then any differences for other first class matches will be described.
Test matches are played over five days, with six hours play each day. Each day's play is divided into three sessions of two hours each, with a 40 minute break between the first two session for lunch, and a 20 minute tea break between the last two sessions. A short drinks break is taken once an hour, or more often in very hot weather. Play usually goes from 11:00 local time to 18:00, although this may be varied if sunset occurs early. The scheduled close of play time is called stumps. Test matches are never played under artificial lighting.
Each team has two innings, usually played in alternating order. Each innings is over when either ten batsmen are out, or the captain of the batting side declares the innings closed (for strategic reasons, more later). When all the innings are completed, the team with the most runs wins. If there is a tie, the result stands (this is rare - it has only ever happened twice).
If by the end of the final day's play all the innings are not completed, the game is a draw, no matter who appeared to be ``winning''. Thus the strategic importance of sometimes declaring an innings closed, in order to have enough time to dismiss the other team and so win the game.
The order of the innings alternates except when the follow-on is enforced. This can occur if the second team to bat in the first innings scores 200 or more runs fewer than the first team. The captain of the first team may then ask the second team to follow on, i.e. to bat its second innings immediately, and defer his own team's second innings until afterwards.
Whenever a change of innings occurs during a session, a ten minute break is taken. If the end of an innings occurs within ten minutes of the end of the first or second sessions, the ten minute break is lost and the scheduled interval is shifted to begin immediately. If the end of an innings occurs within ten minutes of stumps, the day's play ends early.
Test matches are played with a red cricket ball. A new ball is used for the beginning of each innings. The same ball must be used throughout the innings, being replaced only in the following cases:
- The captain of the bowling team may elect to take a new ball at any time after 80 overs have been bowled with the previous ball.
- If the ball is lost, it is replaced.
- If the ball is damaged, either by the stitching coming undone or the ball becoming clearly non-spherical, it is replaced.
In cases 2 and 3, the ball must be replaced by a previously used ball of similarly worn condition to the old ball, as chosen by the umpires. If the ball is ever hit so that a spectator gathers it, the spectator must return it so that play can continue.
On each day of play in a Test match, a minimum of 90 overs must be bowled. If the bowling team has not bowled the required minimum by the scheduled stumps time, play is extended until the required number of overs have been bowled. Whenever an innings ends, the number of overs to be bowled is recalculated, disregarding the number of overs bowled so far during the same day. The required minimum is calculated to be the number of minutes of play remaining, divided by 4 and rounded up. On the last day of play, this formula is used up until one hour before stumps, then fifteen overs are added to the result. If extra overs are bowled before the time one hour before stumps on the final day, then there still must be a minimum of fifteen overs bowled after the time one hour before stumps. All of these conditions are recalculated for time lost due to poor weather, at a rate of one over per 4 minutes of lost time. If a day's play ends early because of poor weather conditions, all calculations are reset for the next day.
If there is heavy cloud cover, the umpires may decide that the ambient light level is too low and that the batsmen may be in danger because of difficulty in sighting the ball. If so, they offer the light to the batsmen, who may agree to leave the field or may decide to play on. If the light deteriorates further, the umpires will offer again. If the batsmen decide to leave the field and the light improves, the umpires make the decision to resume play.
If a fielder leave the field for any reason and then returns during the same innings, he may not bowl until he has been on the field again for as much time as he spent off the field.
Test matches are played in Series between two of the official Test nations. A Test Series consists of a set number of matches, from one to six, all of which are played to completion, even if one team gains an unassailable lead in the Series. Series of three or five matches are most common. Some pairs of nations compete against one another for a perpetual trophy. If a Series between two such nations is drawn, the holder of the trophy retains it.
Non-Test first class cricket differs from Test cricket in only a few respects. A non-Test first class match is usually four days long, not five. In a four-day game, the cut-off figure for enforcing the follow-on is 150 or more runs behind the first team. The formula used to determine the minimum number of overs bowled in a non-Test first class match may be different to that used for a Test match; there is no standard regulation.
Non-Test first class competitions are usually round-robins amongst several domestic teams. Other first class matches include single games between visiting international sides and domestic first class teams.
One-day cricket differs significantly from first class cricket. A one- day match is played on a single day. Either a red or a white cricket ball may be used, and play under artificial lighting is allowed.
Each team gets only one innings, and that innings is restricted to a maximum number of overs. Usual choices for the number of overs are 50, 55, or 60. Each innings is complete at the end of the stipulated number of overs, no matter how many batsmen are out. If ten batsmen are out before the full number of overs are bowled, the innings is also over. If the first team's innings ends in this manner, the second team still has its full number of overs to score the required runs. The timing of the innings and the break between them are not regulated.
Whichever team scores the most runs wins. A tied score stands. There is no draw result. If the match is washed out, so that the innings are not played, the game is declared a no-result.
In each innings, each bowler is restricted to bowling a maximum number of overs equal to one fifth of the total number of overs in the innings. Either a single new ball is used for each innings, or two new balls which are alternated between overs. (This is often done with white balls because they wear much faster than red balls.) New balls are never taken during an innings, but replacements for lost or damaged balls are taken as in first class matches.
In case of rain interruption to the first innings, the number of overs for each innings is recalculated so that they will be the same. If rain interrupts the second innings, making it impossible for an equal number of overs to be bowled, the number of runs scored by the first team is adjusted to compensate. There is no standard adjustment formula - one is decided beforehand for any given competition. There is also a predetermined number of overs which must be bowled in each innings for any result to be considered valid; if this limit is not reached the game is a no-result.
Because of the emphasis on scoring runs quickly, wide balls are enforced much more strictly in one-day cricket.
One-day competitions are played either as Series between pairs of international teams, round-robin competitions between groups of international teams, or round-robins between domestic teams. A World Cup one-day competition is played between all the Test nations each four years.
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