How exactly points in a challenge duel is calculated?

Question

In my case, the win / lose points varies from 1 to 32.
I am not able to figure out the exact method used by sololearn. Looks like they have not made it public.

Answer 1

(Your opponent's language XP / Your language XP) is directly proportional to your Win XP, and

Win XP = (32 - Lose XP) + Answer Bonus

i.e. A modified version of Elo rating system.

Answer 2

See Here www.sololearn.com/far OR https://en.wikipedia.org/wiki/Elo_rating_system

Answer 3

@Hatsy a modification.
For both 32xp and 31xp if you win scenarios, the xp loss if you lose is 1.
You haven't covered the if-win-32xp case in short

Answer 4

@Hatsy Rei - Thanks for info.
Can you confirm what is the modification done by sololearn to the Elo rating system?

@Ekansh kashyap - Thanks for links. There is typo in 1st link, faq instead of far.