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It means that you had an analysis board open following the moves along while playing the game. Take this as a warning to not do that again. You are not banned, but don't continue trying to use assistance.
It means you used analyzis board of the same game in other tab. Which heavily implies you're cheating. You should contact Lichess directly if you have this kind of problem.
This was literally already asked: https://lichess.org/forum/lichess-feedback/cheat-detected-9
It looks to me like white is about to lose a knight. I do not see how this is cheating. An engine would not have moved the knight to the A column I think.
@Ochin_Rat_999 As others have pointed out already, this happens when you open an analysis board at a similar position as on the board and turn the engine on (or have a board like that open from before). It makes no sense to consider whether an engine would play the moves already played since the game was aborted the moment an engine is detected i.e. BEFORE any cheating could happen.
Since this can happen accidentally it doesn't have any direct impact besides aborting the game (at least for the first time) but try to avoid having analysis boards open when playing in the future in order to avoid this.
@GR_GRISSLY
Looking at the game, it could only happen if you had opened the analysis window with same position during live play. Don't repeat the incident, else you would be banned.
Cheating was detected in this game, as indicated on the page. It does not happen by accident.
If you wish to appeal, use https://lichess.org/appeal
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