does external contests( not organised by codechef) affect our codechef rating.
Just writing extra characters because Codechef says ‘answer content must be at least 10 characters’
No, external contest are seldom managed by organizers codechef only provides a platform for contest.
So none of the external contest affect any ratings or rankings of any long or short contest hosted by codechef, so you should participate in them also to improve your skills without any fear of your ratings and rankings.
More you can check it on this codechef’s blog.