Today's challenge was seriously tough, maybe the most difficult one. I didn't really enjoy it, but life isn't always smooth so we just have to keep trying. Like my chemistry teacher says "Chem is try" and I think Math is try too. This got me thinking about the "best challenge" vote. To me, "best" means interesting and doable for high school students, not just hard. Although the concept here (algebro-geometric objects) is extremely unique throughout the entire Math Kalendar competition, I might not end up voting for this challenge. Looking forward to the final challenge tomorrow morning. 