Go to settings in chrome and select manage search engines and click on add button to add a new search engine.
Set a trigger keyword according to your liking (like cc).
In url with %s field write:
http://codechef-rating-predictor.7e14.starter-us-west-2.openshiftapps.com/contest/%s/all/
Now next time you want to know your rating predictions, just enter your selected keyword in the omnibox (url bar), press TAB and enter contest code and rating predictor of that contest will open.
This is just a tip, and the website is NOT made by me.
