“Win either halves” means that a team or player has won one of the two halves of a game. For example, in a soccer match, there are two halves of 45 minutes each, and a team could win either the first half or the second half. In other sports, such as basketball or American football, a game is divided into quarters or periods, and a team could win either of those.
The concept of “winning either halves” is often used in sports betting, where a bettor can place a wager on which team will win either the first or second half of a game. It’s also used in scoring systems for some sports, where a team that wins either half is awarded a certain number of points or advantages.