The ELO ranking system is widely used across multiple games

ELO is calculated based on the outcome of matches. If a player wins against someone with a higher ELO, their rating increases significantly.

Generalizing the Elo rating system for multiplayer games and races

Statistical Analysis of the Elo Rating System in Chess

Understanding Chess Elo Rating: Measure of Skill and Progress

Elo Against the Spread. Elo ROI in the NBA

Become familiar with the Faceit ELO Ranking System - Faceit Finder

Sports with an Accumulative Rating System (84) Years =The number

Developing an Elo Based, Data-Driven Rating System for 2v2

Quantifying human performance in chess

Brawlhalla Ranking System Guide