The way I understand it to work, "Overall score" and "Tournament score", when used in default settings (unchanged), basically formulates everything into a score that bases on average finishing position. That's probably why you see a change. If you have played only one tournament (which now I see on your post that you have, sorry), then this shouldn't change unless you have hits/rebuys/add-ons incorporated somehow. I use my overall, or "Rock" score as i call it, to determine the best consistent player. Also, it turns out, I found that it worked out as a tie-breaker for our Player of the Year (we use Points for determining that). 2 of us finished with the same number of events played and the exact same points total. The overall score broke the tie (one player had 4 wins, the other one had 2, and on paper, that person with 4 wins had a higher average finishing spot than the other player). So that's how I use it. Everyone, feel free to correct me if I am wrong, as I suspect I am not 100% sure this is exactly right.