Since two of the matches' dates and times were still TBA/TBD when I summed up day 3, here's a heads-up on the quarter-final schedule: Grischuk-Aronian starts at the top of the coming hour (1 p.m. ET), and then So-MVL will start three hours later, at 4 p.m. ET. (The times for Carlsen vs. Giri and Caruana vs. Le Quang Liem remain the same--tomorrow at 10:30 a.m. and 2 p.m. ET, respectively.)