What type of bowl must players use according to competition rules?

Players must use bowls from the same set according to competition rules to ensure fairness and uniformity during play. This requirement helps to maintain consistency in size, weight, and dynamics, which can significantly affect gameplay. By using bowls from the same set, all players are competing under identical conditions, which minimizes any advantages gained from using differently manufactured or designed bowls.

Choosing bowls from the same set ensures that the characteristics of the bowls are uniform, which is crucial when competing at any level. It guarantees that all players are familiar with the handling and behavior of their equipment, leading to a more level playing field and allowing skill and strategy to play a prominent role in the outcome of the competition. This standardization is vital in a sport where precision and control are paramount.

Other choices may seem appealing but do not adhere to the primary principle of fairness. For example, allowing any brand of bowls would introduce variables that could distort competition. Pre-approval by umpires generally relates to legality and compliance with specific tournament standards but does not emphasize using bowls from the same set. Finally, while color is a matter of personal preference, it does not address the critical aspects of consistency and standardization that using the same set of bowls provides.