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> There is another way. Statistical analysis on game performance. No one is 3 standard deviations above the mean in terms of their skill.

Assuming normal distribution, 0.1% should be; with top games reaching 1+ million active players, that'd be on the order of 1,000+ players.

And if you start banning people for being too good with no other evidence of cheating, you'll drive of the people who would likely be your most avid non-cheating players.

And I'm not sure the assumption of a normal distribution is even correct. Players will naturally get better at a game the more they play it. Most measures of skill available to a game will end up picking this up more strongly than anything else. The end result would be automatically banning anyone who has been playing the game for too long -- this would be terrible for retention...

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