I have been involved for the past couple of decades with a laser game system known in various parts of the world as Zone 3, Darkzone, Megazone, Ultrazone; and a few other names as well.
Zone is different from almost every other sport in that there are three teams in any one game. This makes creating round-robin grids for leagues and tournaments more challenging than for regular two-team sports: creating a grid in which every team plays every other team the same number of times turns out to be difficult, particularly as the number of teams rises.
Here is a table of tournament grids.
Here is a table of league grids.
Here is an explanation of how to read a grid.
After the round robin, you may wish to use a Cascade.
It's fairly common to finish a league or tournament with a Finals.
Grids also exist for more than 3 teams in a game,
and for just
2 teams in a game.
Here is a table of Swede Base Run format grids.
Here's how we fixture Doubles at ZLTAC.