@petri999 said in #5:
> unfortunately potential gain in linearly dependent on effort you put in. Looking with engine tell you where you made error but not why. And some times - not for obvious tactical errors - at least I cannot even say why solution by engine was better.
Regarding this, when I do not know why an engine's solution is better, I try to disprove the engine's solution and then let the engine disprove my solution. This is iterative as I will also try to disprove the engine's attempt to disprove my solution and let the engine disprove my attempt to disprove its attempt to disprove my solution. This is done anytime I think of a move when going through an engine's solution that I believe is better, be it on my opponent's pieces or my own.
Of course, there are times when even spending a copious amount of time doing this does not allow me to understand why a move is better, at which point, it is wise to move on.