What is Elo rating in Chess?
The numerical measure of playing strength, named after physicist Arpad Elo, updated after every rated game based on results versus expectation. Club players are commonly 1200-2000, IMs around 2400, GMs 2500+, and the world elite 2700+; Magnus Carlsen's 2882 is the record peak.
Example: His live rating crossed 2750 after the win.