The K-factor is used as a weighting and sets how strongly the adjustment should be carried out. If the expected score differs from the achieved one in say a tournament, the system adjusts for this discrepancy. Based on the current players' ratings, the Elo system assigns an expected score to each player. Performance is derived from the game results and the strength of the opponents. The Elo rating system is a relative one and adjusts the player's grading according to his or her performance compared to other players. That leaves us with the K-factor which requires a bit, but not much, of explaining. The options for the results are shown in typical chess notation: 1 - 0 means a win for White, ½ - ½ stands for a draw and 0 - 1 is a loss for the player with the white pieces. You simply plug your own current rating as well as your opponent's one in the first two text boxes, set the K-factor and the game result. Using the calculator is pretty straight-forward and except for the K-factor will not need much of an explanation. We do not recommend using it in the evaluation of official ratings. Please use with Caution as the accuracy of the Calculator has not been verified. For more details please have a look at our Elo Rating System article. Want to find out what your new rating will be after a tournament match or wonder how your rating would change if you – hypothetically – beat the world chess champion? Then you should try our Elo rating calculator which is approximately the same as the FIDE one.
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