It’s how you talk about teams that haven’t played the same number of games. Let’s say team A has a record of 12-5 and team B has a record of 13-5. We would say team B is up half a game. At the end of the season it all evens out and teams can only be ahead or behind by full games, but during the season, teams will have played different numbers of games at any given point due to travel and other and other scheduling issues.
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