CF-Predictor — Know your rating changes!

Revision en3, by Wsl_F, 2017-02-20 23:32:00

Hi guys! As I mentioned on previous contest I'm working on tool that predicts rating changes. I'm happy to present it now!

A huge amount of your nerve cells die every time when you wait for a rating update on Codeforces. Stop this! From now you could use this service, it calculates approximate rating changes for every contestant.

The most interested thing for you is extension. It partly modifies the contest standings page and shows approximate rating changes for every contestant. It is available for three browsers:

Extension in work:

Also you could find more detailed information (seed, rank, expected delta, etc.) here.

A project still in beta, so predictions are not very accurate. Average mistake around 5 points, but for the contestants at the back of standings it could be greater up to a few hundreds.

Tech details

I'd like to thank Rubanenko and all other members of NBHEXT developers team for your shared sources and MikeMirzayanov for the great Codeforces platforms with shared API & ratings formulas.


Prediction for todays contest (cf #399) is absolutely matching real rating changes! Thanks for AlexDmitriev! He was close to find my bug in rating calculation:)

Tags cf-predictor, nbhext, rating, chome extension, api, mozilla extension, opera extension, add-on, extension


  Rev. Lang. By When Δ Comment
en3 English Wsl_F 2017-02-20 23:32:00 265
ru3 Russian Wsl_F 2017-02-20 23:30:26 389
ru2 Russian Wsl_F 2017-02-18 14:07:59 490
en2 English Wsl_F 2017-02-17 23:13:36 478 Add links to Opera & Mozilla extensions
ru1 Russian Wsl_F 2017-02-13 21:26:57 2992 Первая редакция перевода на Русский
en1 English Wsl_F 2017-02-13 21:08:39 2881 Initial revision (published)