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Calculate Your Chess Rating

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Compare your expected score to your actual score

From step (3) : The winning expectancies for your last event were .64 .29 .39 .33 .24.

Your new rating will be determined by the difference between your winning expectancies and the score you achieved.

  • First, add up your winning expectancies:-

    .64 + .29 + .39 + .33 + .24 = 1.89

    This was your expected score for the event.

  • Second, calculate your total score using the three possible results for any chess game. Count 1 point for a win; ½ point for a draw, and 0 points for a loss. In our example event you won two games, lost two games, and had one draw. Your total score was

    (2 x 1.0) + (2 x 0.0) + (1 x 0.5) = 2.5

Since your total score (2.5) was higher than your expected result (1.89), your rating will increase. If your total score had been lower than your expected result, your rating would decrease. If your total score had been exactly the same as your expected result (which doesn't happen often), your rating would not change.

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