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Cricket is a multi-faceted sport with multiple formats, depending on the standard of play, the desired level of formality, and the time available. An important division in terms of major cricket and some minor competitions is between matches limited by time in which the teams have two innings apiece, and those limited by number of overs, in which they have a single innings each. The former has a duration of three to five days (there have been examples of "timeless" matches too); the latter, known as limited overs cricket because each team bowls a limit of typically 50 or 20 overs, has a planned duration of one day only. Typically, two-innings matches have at least six hours of playing time each day. Limited overs matches often last six hours or more. There are usually formal intervals on each day for lunch and tea with brief informal breaks for drinks. There is also a short interval between innings. Amateur cricketers rarely play matches that last longer than a single day; these may loosely be divided into declaration matches, in which a specified maximum time or number of overs is assigned to the game in total and the teams swap roles only when the batting team is either completely dismissed or declares; and limited overs matches, in which a specified maximum number of overs is assigned for each team's innings individually. These will vary in length between 30 and 60 overs per side at the weekend and the ever popular 20 over format during the evenings. Indoor cricket is a variant of the sport played in sports halls during the winter months. At still lower levels, the rules are often changed simply to make the game playable with limited resources, or to render it more convenient and enjoyable for the participants. Informal variants of the sport are played in areas as diverse as sandy beaches to ice floes. ==First-class matches== (詳細はFirst-class cricket is a form of major cricket in which teams of a recognised high standard compete. Test cricket is first-class at international level; the term "first-class" is usually applied to domestic matches. A first-class match must be eleven players per side, two innings apiece and a duration of at least three days. If the game is not completed within the allotted time then it is drawn. Limited overs matches in which the teams have only one innings each are not first-class (see List A section below). Test matches, other games between two Test nations, games between two domestic teams deemed first-class in countries holding full membership of the ICC, and games between a Test nation's national side (or a team drawn from a national touring squad) and a first-class domestic team from a Test nation, are usually deemed to be first class. Matches between Kenya, one of the leading associate members of the ICC, and another team adjudged first-class are usually granted first-class status, but domestic matches in Kenya are not. First-class cricket was officially defined for matches in Great Britain from 1895 and in the rest of the world from 1947. Officially, it has no retrospective status. This has meant that cricket statisticians have created lists of earlier matches which they deem to be unofficially first-class and there has been considerable disagreement about which matches qualify. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Forms of cricket」の詳細全文を読む スポンサード リンク
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