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Hello team of Lichess!!!

On the site there is an option - "computer analysis".She allows to see quantity of mistakes.Whether it is possible to make function the player's ELO allowing to define?I know that there are sites where there is such.It allows as to define when the opponent included the program.And to determine to the player force of the game.Whether my idea is interesting?Whether it is possible to realize it?
THX.
If I understood that correctly, you want the engine to give you an estimate of the opponent's rating based on how they played *on that game*?

That raises a whole host of issues, which is why no serious chess website does this. First of all, the rating system requires a minimum of, say, 30 games to give a reliable rating. It is impossible to guess from just one game. The fluctuation would be very high, so you would get a rating of e.g. 1800±300, which means nothing.

Secondly, it errs close to deterministic evaluations of someone's rating. Engines always try to pick the best move. But they may pick up small inaccuracies which are perfectly sound moves. They are also very poor at evaluating openings.

There are many more issues, but basically, it's not a good idea as it will show incorrect rating estimates.

Finally, and most importantly, Stockfish -- the chess engine used on the site, does not provide such functionality and will _never_ provide that for the reasons mentioned above.

PS: We use the Glicko-2 system, not Elo.

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