Actually, you are not supposed to delete any scores from previous years. Your scores from last year are supposed to be included in this year's calculation (if they are in the previous 20 rounds played). It's precisely for the reason that if you start over your handicap will not be as accurate with fewer scores. If you want to know what your handicap would be for just this year, we've created a feature in your personalized performance report that will enable you to calculate your handicap for just this year. Just go to the Report/Analysis page, choose the yearly summary, and select the single-year handicap option.