Food For Thought: Playing to Win
I think there are a lot of players who would claim to play competitively. However, trying hard to win doesn't equate to top level tournament play, following countless hours of dedicated play testing, experience and refined talent. It's the latter level that Sirlin discusses in his inspired book Playing to Win (even better because it's free!).
Sirlin breaks down, in detail, what he believes to be required to develop into a player that truly plays to win. Note that this is not some call to win-at-all-costs, but rather intended to open the reader's eyes to the mechanisms of exceptional play. This encompasses knowing yourself, and realising your own self imposed limitations.
If you are interested in tournaments or just improving your own play, read this book.