By John O'Brien SINGAPORE, Jan 18 (Reuters) - Golf has come a long way since Tiger Woods changed the nature of the sport following his maiden major triumph 20 years ago - courses are longer, players are fitter and equipment is advancing as quickly as technology will allow. When Woods won the 1997 U.S. Masters with a staggering 18-under total it appeared no course could withstand the best in the game. Players admit that while the weather is one of the major factors in determining the outcome of a tournament, courses do not have to be outrageously long to offer up any sort of resistance to the current crop of top professionals. More...