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Naturally, in this situation, any decision will affect the outcome.
We can impose penalties, declare losses, annul all matches, or leave everything as it is. Any decision I make will seem absurd to someone among the hundreds of players on the forum.
Naturally, we don't know how Loser's cheating affected the results of the matches.
I made this decision because I believe it is the fairest, although far from ideal. I carefully reviewed all the reports. I believe that this decision will least affect the objectivity of the results.
Naturally, the best solution would be to replay the entire tournament. This is impossible.