For many years the World Crokinole Championship (WCC) has used a simple method for rotating players through the preliminary round:
Given that the WCC preliminary round involves three categories and around 300 players (and the possibility of any of those 300 players being a no-show without warning), it’s probably the only rotation methodology that can be used to get the preliminary round completed without encountering several instances of chaos, confusion, and time wasting.
The long-known downside of the WCC preliminary round is that the rotation methodology results in everyone playing a unique set of opponents, such as in the 2025 competitive singles event where everyone would have played a unique set of 10 out of a possible 127 opponents. This is of course in contrast to many other tournaments where the field is split into groups, and everyone within the same group plays the same set of the opponents. So the WCC methodology is a ripe opportunity for some players to get an advantage/disadvantage by playing a relatively weak/strong set of opponents.