Originally posted by FabianFnas
It is easy to win if you play against lower (far lower) players. Then you lose rating even if you win the game.
Actually, since he has been playing mostly players with p1200 rating, meaning they aren't defined either, he had no way of knowing if his opponents were higher rated or not.
I suppose that's the reason his rating is erratic until 20 games are finished. And no sane player with a stable rating will agree to a challenge against someone with a provisional rating since there's no way of knowing exactly what level he's on yet.