if you have the computer analyze your game (and every game that is play on lichess is computer analyzed)... the computer will generate "centipawn" loss, as small positional mistakes that were slightly worse that the computers top choice.
In short, this number gives you some hints on how well you are playing positional chess.
on the other hand...
- tactical mistakes Are a much bigger deal, and I think we are close in rating to suggest that you are probably losing mainly becuase of them
- I find it hard to trust a computer to completely understand positional chess, and I would think it would be a lot less accurate in assessing between two slightly different positional moves than in other parts of the game. if you want help with your positional moves IMHO you should get a coach.
I am just wondering I have got an average centipawn loss of 40 and i wonder what is a good average centipawn loss and can you tell me yours?