To increase your challenger skill to 100% do you have to complete !any challenges or you have to challenge others

Question

increase challenger skill to 100%

Answer 1

Hi, see
https://www.sololearn.com/Discuss/201245/?ref=app

Answer 2

I think you have to win atleast 1000 challenges to attain the 100%

Answer 3

https://www.sololearn.com/discuss/265356/?ref=app