In an incident that generated national headlines, 17-year-old GM Christopher Yoo, upset over a painful Round 5 loss to top-seeded GM Fabiano Caruana at the ongoing U.S. Championship Tournament in St. Louis, ripped up his scorecard, abruptly left the board and — worst of all — struck a female videographer from behind as he left the tournament hall. The U.S. Chess Federation, rightly, immediately disqualified the young California GM, and his games — including the loss to Caruana — will not count toward the final scores.