If you challenge higher level opponents, be prepared for some advanced level topics. Or at least more difficult questions.
Speaking of challenges, I noticed a trend among the top players. They seem to like challenging lower level opponents quite a bit. I mean like 1-4 . Not very honorable I think.
I know the language just not fluently like my English, German, Arabic, Spanish, Italian, or French (Last one I mainly use to go on dates 😎). I know bits and pieces of others.
Anyway I got a 1st hand look at Greek culture on a business trip ~10 years ago. The economy was already showing signs of decline, but I still had some interesting perspective mingling with the locals.