abstract
| - Elo rating system was used in League of Legends ranked games prior to Season Three when the League system was introduced. The Elo rating system is a method for calculating the relative skill levels of players, originally designed for two-player games such as chess. It is named after its creator [//en.wikipedia.org/wiki/ Arpad Elo], a Hungarian American physics professor and chessplayer. The Elo system was invented as an improved chess rating system, but today it has been adapted for use in many other games. Variations of it are also used as a rating system for multiplayer competition in a number of games and has been adapted to team sports including association football, American college football and basketball, and Major League Baseball. In League of Legends the Elo rating of a player was used by the matchmaking in ranked games to find other players of a similar skill level to play with/against before the introduction of the League system in Season Three. Elo was not used for custom and Co-op vs. AI games. The Elo rating for ranked games was different for each type of queue: 3v3 arranged, 5v5 solo and 5v5 arranged teams. The rating was only visible for ranked games after 5 games played in a certain queue type. Players were awarded with medals in their summoner profile based on their Elo at the conclusion of Season One and Season Two. These medals were given as follows:
* Bronze (Old): Between 1250 and 1399 (3v3: 1249-1409, pre-made 5v5: 1249-1409) (Top 25%)
* Silver (Old): Between 1400 and 1519 (3v3: 1410-1519, pre-made 5v5: 1410-1499) (Top 10%)
* Gold (Old): Between 1520 and 1899 (3v3: 1520-1699, pre-made 5v5: 1500-1749) (Top 3%)
* Platinum (Old): 1900 and above (3v3: 1700+, pre-made 5v5: 1750+) (Top 0.2%) About a month before the end of Season 2, a new rating tiers system was introduced:
* Bronze: Between 0 and 1149 (Team: 0-1249) (Top 100%)
* Silver: Between 1150 and 1499 (Team: 1250-1449) (Top 68%-13%) Majority of Active Player Base
* Gold: Between 1500 and 1849 (Team: 1450-1649) (Top 13%-1.5%)
* Platinum: Between 1850 and 2199 (Team: 1650-1849) (Top 1.5%-0.1%)
* Diamond: 2200 and above (Team: 1850+) (Top 0.1%) In addition, rankings were subdivided into smaller sections, like Bronze V or Gold II. These are sectioned off every seventy points of elo (1150-1220 is Silver V, 1220-1290 is Silver IV, etc.). These were the tiers for the North American platform, they differed a bit for other platforms.
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