Often when playing longer time control games I play opponents who are accompanied by high rated (2000+) players who spectate the whole game.
I am aware that those are probably their coaches or just friends who want to help them improve and want to see how they play, in fact that happens to me too and I have no problem with that.
But it is obvious that this can easily be used for cheating by discussing moves, as the moves played will not be engine moves, but human moves much stronger than the player would have played.
The question is: (How) does Lichess rule out cheating in this scenario? Is the performance with or without spectators compared?
No need to care about such rare cases. In about 5 years ago, I helped my friend in chess.com where he is 1400, I am 2000. We were on skype with I am on spectator mode on his games. As first he wanted some advice in some moves but literally the whole game and another games etc for about 30-40 of his games. But no more games since then.
I bet you it is just a minority, the chance of happening in 1% or 0.01% of your games wont change your rating! Isn't it?.
@Onyx_Chess Your video adresses engine cheating, which is not what I want to discuss here
I took meticulous care to make certain that the point would be crystal clear.
No. The point is not "engine cheating".
The point is how increasing everyone's suspicion absolutely creates cheaters and damages the atmosphere, without exception, with only cost, and with no benefit.
Yes, this is what it discusses.
And I disagree with your point. One can be suspicious of certain activities and ask for counter-measures, because one wants a fair play enviroment, and this is exactly the opposite of "creating cheaters".
There are more reasons to be against cheating than being mad about losing games to cheaters.
@MetallicIntuition What are you talking about?!
You've literally managed to not address anything that I've written here, or anything within that video.
In this thread I ask whether Lichess is aware of this circumstance and that it is susceptible for cheating, especially since it would not be found by engine-use scans.
You post a video about how people who feel cheated by engine users might start using engines themselves to "even out the field" and to "learn from it" etc. and how thinking others use engines might make you use engines.
Nowhere in this thread have I wanted to discuss engine use. I do not see how it adresses what I have posted.
@MetallicIntuition , of course it is cheating as your opponent get some kind of unfair external assistance.
@MetallicIntuition I don't think anyone outside of the moderators knows if Lichess compares a player's performance with and without spectators. I rather doubt it. But even if they did, it wouldn't make sense for the staff to publicly discuss the cheat-detection methods they employ so your question, frankly, is kind of a non-starter.
Also, as @drmrboss has stated, it's pretty rare that you encounter a player who has a high-rated spectator watching. I can't even recall that happening in a game of mine and I've played over a thousand. Maybe it's happened in 1 in 100 games? Of those instances, let's just suppose cheating was occuring 20% of the time (and that would be a very high percentage). That would mean I've lost points to this kind of cheating in 2 of 1,000 games.
Honestly, it's just not worth my time to worry about it.
Furthermore, if two players really wanted to cheat this way, I doubt they'd use Spectator mode. They'd probably use TeamViewer, or some other screen sharing software, so the coach can see the player's computer screen and talk to him using a mic-and-headset. In such a setup, there would be no sign of a spectator.
So, to reiterate: This really isn't worth worrying about. In the vast majority of instances when a spectator is present in one of your games, I think you can be confident nothing devious is going on.