hacker.org

Hello, I've noticed, that when I check my current ranking via [url]http://www.hacker.org/forum/profile.php?mode=viewprofile&u=4652[/url], my ranking jumps up and down over the day. Sometimes I'm on level 70, a few hours later on level 36 or even level 20. Then it drops down to level 72 again. I'...