The penultimate match of the round of 16 was played earlier today (if you want to know the result, see the first comment, below, or click here to see Chess.com's report on the match), and it was a good one that came down to the final segment. I won't offer any spoilers here, but want to show you two games from the match, both featuring a terrific new opening idea by Jeffery Xiong. The games both finished rather randomly, with each player winning one game and with both players enjoying winning advantages at different moments in each game; Xiong's idea, however, was excellent, exciting, and of some theoretical significance.