SkillIssueWAGuy's blog

Codeforces Rating Change Maths
By SkillIssueWAGuy, history, 34 hours ago, In English

Hi all, if my performance in a contest is equivalent to the skill of x elo and my actually elo is y, what formula is used to update my elo?

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34 hours ago, # |
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Formula blog i think this is how they calculate ratings

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    34 hours ago, # ^ |
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    That Blog is 15 years old . I am sure there have been changes in the algorithm...

    Edit : Here's a more recent blog published by mike.

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      33 hours ago, # ^ |
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      thank you very much

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34 hours ago, # |
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Don't know about the original formula, but in this case your delta can be calculated as (y — x) // 4 with pretty good precision.

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29 hours ago, # |
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It's almost (x-y)/3.7

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