How can lichess tell im not using an engine

Having no inaccuracies, mistakes, or blunders in a game isn't good, it's just not bad. If you were cheating, you would play at a consistent pace with an ACPL probably below 5. I think you're overestimating how good your games were.

They see if you have the Lichess analysis board open on another tab.
(only method I know)

@InkyDarkBird said in #3:
> They see if you have the Lichess analysis board open on another tab.
> (only method I know)
what if you used chess.com or some other website

Cheat detection is not as simple as that... Not making any mistake doesn't make you an engine user and vice versa. There is a need to at least add some kind of positional complexity information.

Lichess uses some sort of learning algorithm artificial intelligence to analyze games. It is *much* more sophisticated than just your CPL. If you aren't cheating, you don't need to worry about it.

I believe there is a penalty for cheating no ? What if you were to be found ?

@InkyDarkBird said in #3:
> They see if you have the Lichess analysis board open on another tab.
> (only method I know)
No, there are many others softwares which can be misused for cheating such as chessvisionai which even scans the position for you no need for switching tabs and editing boards

i believe the chess community as a whole has every right to find the cheaters and take actions upon them no ?

The anti-cheating tool is highly sophisticated and works with probability.

So dont worry about it, if you are not cheating you wont get banned :)