What responsibilities does a third have during a game?

The role of the third in a bowls game is primarily focused on ensuring that game rules are followed and helping to manage any disputes that arise on the green. When it comes to measuring disputed shots, the third is responsible for doing so to resolve any uncertainty about which bowl is closest to the jack. This is a critical function, as determining the rightful shot has direct implications for the scoring of each end.

Measuring all disputed shots ensures that the game is played fairly, with respect to the rules and the strategies of both teams. The third can step in to make these measurements without waiting for a request, embodying a proactive approach to maintaining the integrity of the match and facilitating smooth gameplay. The other responsibilities considered in the question, such as measuring only when requested, calling for an umpire, or simply taking notes, do not fully encapsulate the proactive and essential nature of the third’s role in maintaining the flow and fairness of the game.