Am I Winning? If so, Who Cares?

Several years ago IM Larry Evans (not to be confused with the GM Larry Evans) wrote a column in Chess Life that included the observation that unless you're annotating a game for publication or considering a draw offer, the question "Am I winning?" is irrelevant. Whether you're better or worse, your task as a chess player is to make the best possible move. It's easy to "slack off" when you think you have a big edge in the position and you let your advantage slip away. And if you're worse it is easy to become discouraged and thereby don't put forth the necessary mental energy to find a way out of your predicament.
In one of his columns on the jeremysilman.com website, IM Rashid Ziatdinov observed that there are only four possible evaluations of a chess position: You're winning, you're losing, you're drawing or the position is unclear to you. The idea of being "better" or "worse" in a position really doesn't mean anything if there's no clear win or draw.
At my level (Class A), if Fritz9 and Vladimir Kramnik determine that I have a slight advantage (whatever that means) I usually lack the skill to turn the small advantage into a bigger advantage.
Opening books may say that Black equalizes against the King's Indian Attack (1 Nf3 2 g3 3 Bg2 against almost everything), but if I am playing White and frequently play the KIA I may have a "practical" advantage in the sense that I am playing a position that I like and am familiar with. The opening tomes seldom take that into consideration.
Anyway, I have to get back to my game. I think I'm slightly better!