Now, since Codechef has announced Integral Problem Difficulty ratings, I have some questions:

**How is Problem Difficulty Rating calculated on Codechef?**

(For instance, in Codeforces, it is calculated based on how many users were able to solve it in the contest.)

**How does CodeChef Problem Difficulty Rating compare with Codeforces? What is approx mapping?**

(Ex: What would be the difficulty rating of a problem on Codeforces, whose difficulty rating on CodeChef is 2441 ?)

(I guess that mapping may be like

Codeforces_Rating(x) == Codechef_Rating(x) — kwhere k is like 200-300 or something. But I am not sure.)

**What is the basic implication of Codechef rating?**

(For instance, in Codeforces, *Approximately this means that if the rating of the problem is equal to yours, then on a typical round you would solve the problem with a probability of 0.5.*

Source : https://mirror.codeforces.com/blog/entry/62865 )

For Codeforces problem difficulty ratings, there are many blogs like https://mirror.codeforces.com/blog/entry/46304,

but there are none for CodeChef. That is why I resorted to asking about it here.