Topic summary
Best-of-seven playoff

Extracted from the Wikipedia article Playoff format.
Best-of-seven playoff
A best-of-seven playoff (also known as a first-to-four playoff) is a head-to-head competition between two teams, wherein one must win four games to win the series. Four is chosen as it constitutes winning a majority of the seven games played. If one team wins the series before reaching game seven, all others are ignored. It is not necessary for the four games to be won consecutively. Draws are not permitted, even in sports where they usually would be; play continues until there is a winner. This ensures that a series will never require more than seven games.