that is what I thought you meant.

one of my usual inelegant solutions (but works - copy into points for playing area of the game tab):

10 + switch(r, 1, n*1, 2, n*0.9, 3, n*0.85, 4, n*0.8, 5, n*0.75, 6, n*0.7, 7, n*0.65, 8, n*0.6, 9, n*0.55, 10, n*0.5, 11, n*0.45, 12, n*0.4, 13, n*0.35, 14, n*0.3, 15, n*0.25)

So, it gives 10 points to everybody in the tourney, then if the rank (r) = 1, it adds points of the number of players (n) * 1, if rank = 2, then it adds points of the number of players * 0.9, etc,