The anticheat needs to be server-side to be credible, i.e. the game should be designed to only provide the information that client needs for fair play. I know this isn't easy, but it should be the goal.

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Dwedit 3 hours ago | parent [-]

Client still needs to know coordinates of opponents and other objects that could be in their view within the next 200ms, and once the client knows those, a cheating client can reveal opponent positions. You can't enforce that server side without adding huge mandatory lag to all clients.

	▲	abuob 39 minutes ago \| parent [-]
		But you can detect serverside (at least probabilistically) if a user is abusing it to their advantage. Some Valve guy gave a great talk about their cheating detection a while back; I found it incredibly impressive: https://youtu.be/ObhK8lUfIlc (can't comment on their effectiveness these days, haven't played CS in a long time)