Transfer of xps depends on your level and your opponent's level.
It your opponent's level is more and you lose transfer of xp will be less.
If your opponent's level is less and you lose transfer of xp will be more.
Usually 1 to 32 xps can be transferred.
The amount of transfer depends on some factors:
- how many questions you answered right
- how many were a TIE between you and your opponent
- what badge do you/ your opponent have/ has.
- what level of perfection do you have in that langauge (you can check it in your profile's challenge section)