Well... I AM sure about this fact. How will you ever be able to improve your chess with the centaur? If you make a mistake, the centaur will also make one, maybe one or two moves later. He will not give you a hint, where you made a mistake. That's the problem. Of course. If you lost a pawn or a knight (or whatever) for nothing, you will recognize it yourself. But will he explain that you got a bad position because you didn't take care of open lines or diagonals? No. Will he explain, that the structure of your pawns is bad? No.

Maybe someone took some advantages from playing with the centaur. I don't know. But then I would be interested to hear, in what way the centaur improved the playing abilities of this user. What did you learn and how?

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Mein Profil beim ICCF (International Correspondence Chess Federation)
https://www.iccf.com/player?id=89948&tab=3