Mathematician Arpad Elo developed his rating system for the game of chess.

The ELO Rating was invented by Arpad Elo.

It was an improvement of the "Chess Rating System".

It reflects the relative skill levels of chess players.

A Grandmaster holds an ELO Rating higher than 2500.

A beginning chess player will start at around 1200-1400.

Depending on your opponents rating and the outcome of a rated tournament match you will gain or lose ELO points based on the ELO of your opponent.

The Elo rating system is a method for calculating the relative skill levels of players in two-player games such as chess. It is named after its creator Arpad Elo, a Hungarian 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. You can obtain Elo by winning ranked games in League of Legends.

It is a system to rate various Scrabble players. The Elo system originally was developed to rate chess players. It later was adjusted to rate various other competitive games. See related links for further discussions about Elo ratings.