Hans Niemann, the 19-year-old who has confessed to cheating in online games but denies any illegalities over the board, faces a crucial credibility test at St Louis on his US Championship debut.
The organisers have beefed up security, with spectators barred, a new metal detector to frisk players and a 30-minute delay before the games are displayed to online viewers.
Live online coverage now starts at 7.30pm. Niemann is the sixth seed on current ranking in a field of 14, behind the five grandmasters who represented the US in the recent 180-nation Olympiad, but ahead of experienced GMs and other rising talents.
The impact of his success or failure on his championship debut will be greatly magnified due to the allegations against him.
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