Mark Twain called it "a good walk spoiled." Lee Trevino said it was the most fun he ever had with his clothes on. For duffers and pros alike, golf can be both a delight and a torment--often on the same day, sometimes on the same hole. How difficult can it be to take a stick and knock a small ball into a hole? In the obsessive examination of that question lie the joys and sorrows of many a dedicated player. (Is obsessive too strong? Just ask any avid...