Niemann "had cheated more than he admitted," according to Carlsen
Niemann claims to be "clean" now after cheating as a youngster
After upsetting the chess community by abandoning a game after only one move one week earlier
Hans Niemann, 19, was accused of lying by Magnus Carlsen, the current world champion
Elite chess has been rocked this month by bombshells
Grandmaster of chess Andrew Tang gave Carlsen credit for bringing up “an problem
Carlsen, a long-time world chess champion, support up his claim against Niemann
He claimed "unusual" advances in Niemann's global ranking
On September 4, both players underwent a security check before their live game
In the last three weeks Carlsen has been accused of not being transparent enough
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