Bojack_human's blog

Is cf predictor broken?
By Bojack_human, history, 4 years ago, In English

I am shown 79+ in Educational Codeforces Round 108 (Rated for Div. 2) but i get only 50+ after actual rating changes happen.

  • Vote: I like it
  • +32
  • Vote: I do not like it

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4 years ago, # |
  Vote: I like it +2 Vote: I do not like it

Yes, same thing happened to me. It seems like the predictor somehow takes the div 1 participants in consideration too when calculating the rating, even though it is rated only for div 2.

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4 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Cf predictor show incorrect delta changes many times.

Instead use this extension : https://chrome.google.com/webstore/detail/carrot/gakohpplicjdhhfllilcjpfildodfnnn?hl=en

This one gives more accurate rating changes.

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4 years ago, # |
  Vote: I like it +11 Vote: I do not like it

CF predictor is not really "broken". For yesterday's contest, it was considering our rating from 2 contest back. When I visited the site, it showed that i was rated 1998 instead of 1873. Maybe it's due to these rating roll-backs that are happening.

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    4 years ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    Yes, that must be the issue. Neither my friends' rating or mine are up-to-date.

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4 years ago, # |
  Vote: I like it +9 Vote: I do not like it

Try using carrot. Works fine.

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4 years ago, # |
  Vote: I like it +6 Vote: I do not like it

Yes, I also agree to this I was shown +61 by CF predictor but got just +31

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