If the jack is suspected to be short, how should the umpire check its length?

To determine whether the jack is short, the appropriate method for an umpire is to center the jack and measure from the center of the mat line. This approach ensures that the measurement is taken accurately from a standardized reference point, which is crucial for maintaining fairness and consistency in the game. By using the center of the mat line, it establishes a definitive starting point for assessing the distance to the nearest ditch, allowing the umpire to apply the rules effectively.

Using the center of the mat line as the reference avoids ambiguity in situations where players might have differing opinions about whether the jack has reached the minimum distance required. It is critical that the umpire’s measurement is based on established procedures to uphold the integrity of the game.

In contrast, other methods, such as measuring only from the rear ditch or from the nearest bowl, can lead to inconsistencies and potential disputes, as they do not follow the proper protocol for measuring the jack's position. Verifying players' claims without any measurement would also undermine the authority of the umpire and could lead to disagreements on the outcome of the play. Thus, centering the jack and measuring from the center of the mat line aligns with the regulations governing the sport, ensuring that all measurements are objective and reliable.