grenv: All four are reasonable and good suggestions. I personally am happy with any system as long as their is a chance for 1 to meet 2 in the final round. In many games and sports, there is the 1-64, 2-63 and so on. In chess there is the 1-33, 2-34 and so on. And in a game like tennis, there is no set pairing except that the top two can't meet until the final, the top four can't meet until the semis and so on.