Arpad Elo, the inventor of the Elo rating system The Elo[a] rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess or esports. It is named after its creator Arpad Elo, a Hungarian-American physics professor. The Elo system was invented as an improved chess-rating system over the previously used Harkness system,[1] but is also used as a rating
![Elo rating system - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/280f6ab0b29209c192fc61a01d66cf72a091486d/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fen%2Ff%2Ff0%2FArpadElo.jpg)