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An anti-cheat system is definitely needed for the forum. :)
Honestly, there have been a couple of cases where I was playing online, and after the game, the opponent wrote that it was his brother or uncle playing, it doesn't matter... :)
Therefore, to avoid controversial situations and disagreements, I suggest adding a clause to the rules of online games: "All actions performed from the Player's computer are recognized as his conscious actions, and the Player is responsible for them."
P.S. If you've already started playing online, respect your opponent; if you need to leave, turn off the game and don't be rude. Isn't that logical? :)