Is there an extreme skill difference depending on what time you play?

[Luc@s]

there are different factors that could explain why someone finds it harder or easier to play at specific hours of the day (including the ping)

i would say that in a game where everyone faces everyone, regardless of their geographical situation, there is no skill discrepancy between different locations.

this is different in games where (for instance) european players barely face american players.
that's why i've been trying a bit to determine the impact of such a phenomenon on elo rankings