HenryB

I can think of a couple of reasons why you might get a table that differs by .01 VP at some values. The procedure to determine values is to round first, then truncate. More specifically, truncate to three decimals, then round to two decimals with .005 rounding up. The "adjustment" algorithm for the USBF scales was then "eyeball" rather than computer. The WBF scales will use the mechanism shown in my previous post.

The function is VP(Winner) = 10+10*((1-Tau^(3M/B))/(1-Tau^3)) with a maximum of 20 VP(loser) = 20 - VP(winner) where Tau = (5^.5 - 1)/2 which is the "golden mean" and approximately 0.618... M is the margin B = 15*(number of boards^.5) Both values are rounded to 2 decimals and truncated Occasionally because of the rounding the rule V(i+1) - V(i) <= V(i) - V(i-1) will be violated. In that case the value of V(i) is increased by .01. Usually this will eliminate all violations; sometimes it takes as many as four iterations of this procedure to eliminate all of them. A VP score of 15-5 will be achieved when M = B/3 (five times the square root of the number of boards) A margin of 2B/3 will get a VP score of 18.09 A margin of B or greater will get a VP score of 20