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How to calculate Live Chess Ratings You can use FIDE's rating calculator to calculate changes to ratings for every game. Rtg = Rating of a player according to the previous list For single game calculations, keep the following values for W W=1 if the player has won W=0.5 if the player has drawn W=0 if the player has lost For the top player list, use Kval = 10 Example: If Kasparov returns to play rated events, plays Carlsen and wins one game, the calculation is as follows. (Assuming Carlsen's rating to be 2786) Rtg = 2812 Rc = 2786 W = 1 Kval =10 Click Calculate . Kasparov will gain 4.6 points for the win against Carlsen, who in turn, will lose that many points.