All informations about Worldwide Combos tournaments.

Worldwide Combos has a built-in tournament system that can host "quickfire", or "blitz" tournaments. Their usual length is between 1 and 2 hours, though it is definitely possible to have them last longer or shorter by changing some of the parameters.

Tournaments may or may not have prizes, usually tournaments with prizes require players to have a validated account, while others are usually open to anyone, including guests. Seasonal events may also require players confirm their country or region and have it locked until the end of the current season. Some events (e.g. qualifiers) may be restricted to some players, either based on whether they are already qualified or not for the target event, or they do not belong to a specific region. Prizes are usually either Worldwide Coins or cash prizes, though this is not a strict rule.

As of now, the tournament system handles (at least partly) "open phases", "pool rounds" and "single elimination brackets". Most official events nowadays feature an open phase and a single elimination bracket.

An open phase consists of a matchmaking system that is completely independent from the quickplay matchmaking, but the matching algorithm is the same. Additionally, there is a rating limit that increases every minute, such that players that are below that limit at some point while neither player nor queueing are eliminated. The open phase ends once the number of remaining players reaches some previously fixed target and the late registration period (see below) is over.

The bonus points are also computed in a different way than in Quickplay: after every round players receive either their remaining bonus points or 37,5% of the K-factor (whatever is smaller), this amount is then deducted from their remaining bonus points.

Rating decay also works differently. Once late registration is over, players are expected to start at least 2 rounds during each 10 minutes time interval (e.g. between 0 and 10 minutes after late registration ended, then between 10 and 20 minutes, etc.). If they do not, then at the end of the time window they are granted a loss with maximal rating change versus the current highest rating of the tournament, for every missing round. Points that are lost are added back to the bonus points, meaning they can be retrieved if the players starts playing again.

Once the open phase is over, remaining players are ranked according to their final rating. In case of a tie, if the tournament's ruleset is an official ruleset then the tie is broken according to the players' current multiplayer rating in this ruleset, otherwise No Limit and Tuning Limit ratings are used depending on whether Tuning Limit is off or on. Eliminated players are ranked according to their elimination time, in case of a tie the player with the highest final rating is ranked above.

The following parameters are defined for an open phase:

- Late registration: period during which players may register late and start playing. Usually decided so that payers registering at the very last minute still begin with a rating higher than the current rating limit.
- Initial rating: as the name says, every player starts with this amount of points.
- Initial rating limit: the rating limit is equal to this exact value right when the open phase starts.
- Rating limit speed: every minute, the rating limit increases by this amount of points.
- Initial bonus points: the net amount of bonus points a player may win during the open phase.
- K-factor: the K-factor used for the rating change formula.
- KO difference limit: the required KO difference to get the maximal rating change.
- Number of players advancing: the open phase ends once the number of remaining players reaches this number and the late registration period (see below) is over.

When the tournament's ruleset is an official ruleset, the open phase rounds may count towards multiplayer ratings. This is done retroactively, when a rating recalculation occurs.

In a pool round, players are split in several pools and players within a given pool all play each other once. Players are then ranked based on their win rate, the difference between rounds won and lost, the number of rounds won, the sum of KO differences, etc... Some amount of players advance to the next stage of the tournament, while others are eliminated, only after all the matches are played.

Pools are decided through some initial seeding. If the tournament's ruleset is an official ruleset, then seeding is decided according to the players' current multiplayer rating in this ruleset, otherwise No Limit and Tuning Limit ratings are used depending on whether Tuning Limit is off or on.

The following parameters are defined for an open phase:

- Maximum number of players per pool: if the number of participants is not a multiple of this number then some pools will have less players than that.
- Number of players advancing: based on the rankings including players from all pools.
- Score limit: matches are "first to X, win by Y".

A single elimination bracket consists of a tree where players are seeded, for every match the winner advances to the next round while the loser is eliminated. The last player remaining wins the bracket, though the bracket may end earlier if needed.

Brackets may be seeded in several ways: pool round results, open phase results, or simply multiplayer ratings. There may be also tweaks in the seeding so that, for instance, several players from the same previous pool do not play each other in the first round.

At the end, players being eliminated at the same round are ranked based on their initial bracket seed.

The following parameters are defined for an open phase:

- Seeding tweak: optional.
- Number of players advancing: based on the final rankings once all rounds that were meant to be played are.
- Score limit: matches are "first to X, win by Y".

Worldwide Combos 6.6.2

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