A league is the core container for play on the platform — the place where rules live, where your daily picks are made, and where your results are tracked over time. Every league defines its own structure: what kinds of plays are allowed, how many you can make, how many legs a play can have, and how competition inside that league works. When you join a league, you’re stepping into a specific ruleset and a shared scoreboard with everyone else who plays there.
Leagues come in two broad forms: Public Competition Leagues and Private Leagues. Public Competition Leagues are open to everyone and are designed for large‑scale play — dozens or hundreds of players all competing under the same rules. Private Leagues are invite‑only spaces where a smaller group can play under the same rule framework but with their own membership. Both types can participate in competitions, but public leagues are discoverable while private leagues are intentionally closed.
Every league has a set of parameters that define how it works. These settings shape the experience for everyone inside the league and determine what kinds of strategies are possible. Below is a high‑level overview of the major components, with links to deeper explanations where needed.
Event Pools
Every league is built on top of one or more event pools. An event pool is simply the set of games or matchups that the league draws from according to it's schedule. These pools determine what appears on the league’s board and what you can use to create plays.
Learn more about event pools →
Schedules
Each league has a defined schedule that determines when it is active and when events are available for play. This schedule can be daily, weekly, or customized in lots of ways, and it governs the availability of matchups and the timing of competitions.
Types of plays
Each league defines which play modes are allowed: straight plays, parlays, or unit‑advantage (handicap) plays. Some leagues allow all three; others restrict the format to create a specific style of competition.
Learn more about league schedules →
Number of legs per play
Leagues set both a minimum and maximum number of legs for any submitted play. A league might allow single‑leg straight plays only, or it might allow multi‑leg parlays up to a defined cap. These limits shape how risky or conservative players can be.
Daily play limits
Leagues define how many plays a user may submit per day. Your personal tier may allow more, but league rules take precedence — if a league allows two plays per day, then everyone in that league is capped at two regardless of tier.
Play generation
ROP generates games for the board in a couple of ways; some leagues show all available matchups, while others use a randomized and weighted selection process to create a unique board each day. The weighting factors can be customized by league admins to promote certain types of games or teams, or to create a specific flavor of play.
Most of the public leagues use a randomized & weighted play generation algorithm. This means that the matchups available on your board each day are selected from the pool of eligible events based on a combination of randomness and customizable weighting factors.
Learn more about default weighting factors →
Learn more about customized weighting factors →
Parlay vs. Straight vs. Unit Advantage
These are the three fundamental play structures:
Each league chooses which of these modes it supports, and that choice defines the rhythm and difficulty of play inside the league.