I don't know whether it's fair to call a blunder in a blitz game one of the biggest in chess history, but this game (played just a couple hours ago) led to Vassily Ivanchuk's elimination from the World Cup.
Alexander Grischuk and Peter Svidler, both of Russia, will play for the World Cup title. Ivanchuk and Ruslan Ponomariov, both of Ukraine, will play for third place and automatic qualification to the next World Championship cycle. Follow the action here, beginning well before dawn on Friday.
A heartbreaking loss for Ivanchuk!