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Player Vitalik was not banned. CMCH simply means that he cannot participate in tournaments, if I'm not mistaken.
P.S. The case with Andrey is telling. In general, it's not the player who should prove their honesty; that would be self-disrespecting in this case. Instead, they should be presented with evidence of their dishonest gameplay.
It seems like this is just common sense, something even a seven-year-old would understand.
