HP MoR: The intermittent glitch in the Marauder’s Map is the appearance of a marked Riddle or Voldemort on the map in places without people

Created by gwern on 2012-04-12; known on 2015-01-01; judged wrong by Oscar_Cunningham on 2015-03-26.

• gwern estimated 25% on 2012-04-12
• JoshuaZ estimated 55% on 2012-04-13
• Oscar_Cunningham estimated 10% and said “Fred and George not telling anyone would mean they were both carrying idiot balls.” on 2012-04-20
• Oscar_Cunningham   judged this prediction wrong on 2015-03-26.