The same way that people will cheat at cards or any other game - preparation.
I sincerely believe that many people would benefit by putting the time spent perfecting cheating into the game, and have almost as good a result with no jail time.
In this case there have been rumors from signals from an audience member to vibrating beads ... save your sanity and don’t look it up.
Grandmasters have been busted before looking at cell phones in restrooms or catching outside signals. With the strength of modern computers it is relatively easy to find the “best” move and play it every so often.
Cheating doesn’t need to happen every turn, but just enough to keep you ahead of the other guy.
In this case there have been rumors from signals from an audience member to vibrating beads ... save your sanity and don’t look it up.
In this case at the Sinquefield Cup, there is no plausible rumor of signals from an audience member. There was no audience.
The use of anal beads was a joke made by Canadian GM Eric Hansen which went viral while leaving out the part that it was just a joking remark.