My long contest rating fell suddenly from 1653 to -906 in JAN even though I attempted no questions in DEC or JAN. I was just wondering what caused this huge drop?
Ratings are relatively calculated. I can see you attempted ONEKING in JAN15, and left it unsolved. When you attempt a question in any contest, you are marked as a participant of that contest. Now when ratings were calculated, nearly 8k users have performed better than you (as there were nearly 8k users in JAN15 with atleast one AC, you had none). And hence have your ratings fell.
Had you not attempted any question, your ratings would have been unchanged.
ahh… Thanks. That clears up that for me.