Dan G schrieb:

- two accident reports with the same date
- an accident report with two aircraft registrations

Thanks for your advice. I found two incidents I'd missed and one which
was actually two seperate accidents occuring on the same day.

I've just realized that it's a bit more involved: There not only is the
category gliders, but also motor gliders. Now if a glider hit a motor
glider, then the two reports show in different categories. You actually
have to sift through *all* accident reports and check for two with the
same date.