### Rating System

February 5, 2019 at 8:22pm# Rating System

February 5, 2019 at 8:22pmChess sites like lichess and chess.com have a rating system (based on ELO, I think), so that you can quickly estimate the strength of different players. This means that if a player rated 2000 is playing a player rated 1600 the two players might want to put different wagers based on their expected chances. Plus, rating seems to motivate players to improve and adds fun to the experience.

February 6, 2019 at 12:06pm

February 6, 2019 at 8:27pm

https://en.wikipedia.org/wiki/Elo_rating_system
there's some fancy math in the wikipedia article but you can think of it as everyone starts from a base rating, say 1200, and then for each game win you add to your rating a certain number of points that is based on the rating diff between you and your opponent. If you won against someone higher rated you get more points, if you won agaisnt someone lower rated you get less points.If you lose the game you subtract from your rating, again, based on the rating diff (and indeed, if it's a draw, the lower rated player gains a few points and the higher rated player loses a few).