It is possible to compare these three scoring programs applied to
an existing competition after the fact. I originally used
my
scoring program in SeeYou using the OzGAP 2005 scoring equations, but I used
FS to compare the three versions of GAP, as I am just in the process of
developing a "leading" points version of my scoring program (to calm the
overblown concerns of some pilots, and because I think I can).

Now the first objection to doing such a comparison, is that the pilots knew
which scoring system was being used to score the competition so that they would
adjust their behavior to optimize it for that scoring system. While I'm sure
that they would attempt to do this, it is unclear to me if there would be any
actual changes in their behavior based on what they assumed the scoring system
would be rewarding. It was still get to goal as fast as possible as early as
possible no matter which scoring system was being used.

The point of any points other than speed and distance is to get pilots going as
early as possible and not reward as much the pilots who wait back in the start
cylinder and then use the pilots in front of them to get to goal faster and
safer. For the vast majority of cases the pilots who made goal started within
one time interval of each other. Most often they started together.

So are the results different depending on which scoring system is used? Not for
the first five pilots and only minor changes for the rest of the pilots.

The competition scored with GAP 2000 (departure and arrival position points) is
seen
here.

The competition scored with GAP 2002 ('leading' and arrival position points) is
seen
here.

There is no change in the order of pilots until the twenty third pilot out of
twenty seven when Jamie Shelden and Gennadily swapped places.

The competition scored with OzGAP 2005 (arrival time points) is seen
here.

The first swap occurs at the sixth pilot as Joe Bostik gets swapped with Chris
Zimmerman. The second swap occurs at the tenth slot with Rick and Wolfgang
swapping. Jamie and Gennadily go back to their original positions.

I would suggest that these changes are minor and that it really doesn't matter
much which scoring system you use. That any of the three scoring systems are
reasonable and close enough to point to the top pilots.