League system

League system is a ranking system that matches players of a similar skill level to play with and against each other. It comprises nine tiers which indicate the skill level of players. Players within each division are ranked using a system of points called League Points (LP).

Players can monitor their league standings in their profile.



Tiers and Divisions
Season 2019= Each tier from Iron to Challenger is divided into four divisions, depicted by a  between IV (4 being the lowest) and I (1 being the highest).

Tier Trims
Under the profile banner there's a trim that highlights the tier a person was the previous season.

Season 2019=

League Points
Players earn League Points (LP) when they win ranked games and lose them when they lose ranked games. The amount earned or lost depends on the player's hidden Match Making Rating (MMR). The higher the MMR, the more LP earned per win and the less LP lost per loss.

League Points inactivity decay
Players in Platinum and above lose a set amount of LP if they don't play ranked games after 28 days, reduced to 5 days in the master and challenger tiers. Afterwards, they continue to lose the set amount of LP every 7 days until they play a ranked game. The amount of LP lost is different for each tier:


 * Platinum - 35
 * Diamond - 50
 * Master & Challenger - 100

Master and Challenger decay work differently with a game banking system. Playing games adds towards the player's "banked games", up to a maximum of 10 games. 1 game is removed from the bank per day, and when the bank reaches 0, the player loses LP per day until they bank more games.

Notes:
 * Inactive players cannot be seen by others in the ladder view.
 * The LP decay does not affect MMR.
 * Promotions Series end after 28 days (even if you play games within 28 days).

Provisionals
Players entering a new ranked ladder will be placed in a provisional period that determines their rank on through the end of the period. During this time, there is no loss of LP nor promotional series, and the player's rank is private.

Promotion
Players who reach 100 LP in their division automatically start a set of games called promotion series. When promoting within a tier, these games are a best of three. When promoting to a new tier, these games are a best of five. Winning the series will advance the player's division, while failing the promotion results in a setback of LP. Leaving a match either during champion selection or during the game itself counts as a loss in the promotion series.

Players who promote to a higher division have their LP reset to 0. Players who lose their promotion series will have LP equal to 100LP minus an amount of LP per promotion game lost, plus an amount of LP for any promotion games won.

In very rare occasions players are promoted twice when they win a promotion series. This happens with players whose MMR is unusually high for their current division. For instance, the MMR of a Gold V player who plays duo queue often with his friend in Platinum III might be unusually high because he's matched often against higher level players. As a result, his MMR can be 1 or 2 divisions higher than the average in his current division. Another reason for unusually high MMRs is queue dodging. Queue dodging carries a penalty of 3 LP for the first dodge of the day and 10 LP for further dodging.

Since Season 4 it is possible, however rare, to skip promotional series. This happens with players whose MMR is one tier higher than their current placement. For example, a Gold V player whose MMR is Platinum IV or higher is instantly promoted upon reaching 100 LP. It is possible to skip both divisions and promotional series.

Demotion
Players are demoted when they lose matches at 0 LP or through inactivity decay. Demoted players move to the next lower division and their LP is reset to 75. E.g.: When a Gold II player gets demoted he falls to Gold III and has 75 LP.

Players who promote to a higher division enter a demotion immunity period that lasts for several games. The purpose of the immunity period is to prevent players from being demoted due to bad luck. However, Masters players demote after playing at least 3 games and then losing with 0 LP.

Match losses caused by server problems don't count for promotion series.

Since Season 4 it is possible to be demoted from a tier. Players in the division V of a tier whose MMR drops an entire tier are warned about possible demotion. For example, a player in Gold V will receive a warning upon reaching Silver V MMR.

Challenger Tier
The Challenger tier is the highest tier in the League ranked system which consists of the 200 most skilled and competitive League of Legends players. There is no LP limit, but players must overtake each other's counts to gain standing. Every 24 hours the top 200 players will promote to Challenger, placing lower will result in demotion.

If a player reaches Challenger tier in solo/duo queue, even if they don't have a ranked team, they are likely to be spotted and possibly recruited by a professional team.

Information about previous seasons

 * In Season One and Season Two, the system used a single ladder with ranking determined by an Elo rating system.
 * Season Three introduced the multiple-tier league system, with each tier having 5 divisions (except for Challenger).
 * Season Four introduced the Season 2014 - Master.png Master tier (with only one division).
 * Season Nine introduced the Season 2019 - Iron 1.png Iron tier and the Season 2019 - Grandmaster 1.png Grandmaster tier, as well as reducing the number of divisions from 5 to 4.

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