The Elo rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess. It is named after its creator Arpad Elo, a Hungarian-American physics professor.
Arpad Elo, the inventor of the Elo rating system
Chess is a board game for two players. It is sometimes called international chess or Western chess to distinguish it from related games such as xiangqi and shogi.
Part of a Staunton chess setLeft to right: white king, black rook, black queen, white pawn, black knight, white bishop
Setup at the start of a chess game
A digital chess clock
Public chess tables in the Jardin du Luxembourg, Paris