Going from Expert to Master What is the difference in mindset or technique that really makes the difference between an expert and a master?  I am trying to decide whether or not to start playing again and try to make that leap.
To become a master from expert, I think having a mentor is the most important factor. I know personaly a chess player who got elo rating from 2000 to 2300 with a well-known mentor from Switzerland.

Moreover, I think knowing theory and playing against very good players (2400+) can really help.