The powerplay rules along with a number of other factors, have contributed to the big scores in modern One Day Internationals since 1992.
[2] One Day International (ODI) and Twenty20 differ in terms of the number of overs where mandatory powerplay rules apply.
In most domestic leagues and international Twenty20 cricket, the first six overs of an innings will be a mandatory powerplay, with only two fielders allowed outside the 30-yard circle.
[4] Fielding restrictions evolved through the 1970s, notably in World Series Cricket,[5] and were first introduced in ODIs in 1980 in Australia.
[6] In practice though, both were generally taken as soon as possible, effectively leading to a single block of 20 overs of fielding restrictions.