Chess Olympiad: Understanding the Elo system that's used to rate

Not just chess but in some zero-sum games (a principle in game theory where a player's winnings is directly balanced out by the losses of their opponent) Elo rating is considered as the gold standard.

Elo rating system - Wikipedia

Elo Rating System - Chess Terms

Elo Rating System. NOTE: Medium doesn't display subscripts…

Elo Win Probability Calculator

Elo and Glicko Standardised Rating Systems – TOM ROCKS MATHS

Statistical Analysis of the Elo Rating System in Chess

Statistical Analysis of the Elo Rating System in Chess

Current average chess rating - Chess Forums

WIP] Elo Loss: From Chess Ratings to Objective Functions - Rishabh

Explained: The Elo Rating System Used by FIDE to Determine

Elo Calculator Elo Rating Calculator

Distribution of chess skill as measured by Elo rating in FIDE