Isn't that war over? I mean didn't we all think that GAP 2002 was
a big improvement over GAP 2000? I use my cases to examine if much changed when
we went from departure to leading points. Let's start off with a chart and then
I'll explain it:

Now, obviously there is not enough information about this chart to understand it at
first, so let me fill you in. The number 1 case refers to the flights
illustrated in Case 1b in the last issue of the Oz Report. I score the flights
using leading points and then departure points. The left most column (red) is
the first pilot. The second column (green) is the second pilot starting twenty
minutes later and flying as fast. The third column (purple) is the same first
pilot scored with departure points (still 1000 points) and the fourth column
(blue) is the second pilot who flies as fast but starts twenty minutes later and
is scored with departure points and arrival position points. The basic idea is
that it hardly matters which of these two scoring systems you use as they
produce about the same result in this case.

Case 2 (both pilots start at the same time but the first pilot is faster than
the second) produces the same scores under both scoring systems.

Case 3 (both pilots start off at the same time, but the first pilot is faster
and gets to goal and the second pilot lands before goal) produces a different
result between scoring using leading points and departure points that is totally
attributable to "leading" points. The second pilot gets some leading points but
doesn't get any departure points as he doesn't make goal as departure points are
a multiple of speed points which he also doesn't get as again he doesn't make
goal.

Case 4b (the first pilot starts twenty minutes before the second one but takes
forty minutes longer to fly the course). The fastest (second) pilot gets the
full 1000 points as he gets all the distance, speed, arrival position and
leading points. The first (slower) pilot gets distance, slower speed, all the
leading points and reduced arrival position points. When scored with departure
and arrival position points, the fastest pilot who starts second gets a lot less
departure points than he would leading points. The slower first pilot scores the
same with either leading or departure points.

Case 5b (the first pilot is caught by the faster second pilot at the midway
point and they fly together to goal). The faster (second) pilot doesn't get all
the leading points as he starts behind the first pilot and then stays with him
to goal. He also doesn't get all the departure as he starts second. The slower
pilot gets the same score using either set of scoring equations.

Case 6 (the first pilot starts twenty minutes before the second one - one start
time interval - and they both arrive at goal at the same time). The second pilot
loses some leading points but gets the rest of them. The first pilot gets all
the leading points, but loses speed points. When scored with departure points,
the second (faster)  pilot receives less departure than leading point, but
gets the rest of them. The first (slower) pilot gets all the points except fewer
speed point.

Well, enough of these leading points, next I'll turn to looking at Arrival time
points, otherwise known as OzGAP 2005.