I have learned that many people don't appreciate to be told about how they play and what was not a good move and what would have been better, etc., no matter if the advice is good or bad or wrong. I think it takes a certain mood to be open for critic (and I have times where I don't want any, no matter how well-meant and helpful).

So I generally don't offer any advice or comment unless asked to.

Even if I have to bite my tongue.