To accommodate TAS.
TAS plays as Newington 3rds. As I understand it TAS has no home games
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I don't pretend to understand all this, but based on discussion here there appear to be two sets of issues that overlap.
The first are the changes to the firsts/seconds comp with shortening plus more trials against CAS in particular but also ISA. We have seen how this has caused the forum discussions to overlap. What this means for the longer term is the subject of much discussion.
Shortening the top level comp had flow-on effects to the larger thirds comp. By larger, I simply mean more schools. Under the previous format all schools played each other with a bye to accommodate the fact that there are nine GPS schools. As part of the process, TAS had two home games. This meant that each Sydney school would, in theory, visit Armidale once every two years.
Maintenance of this format with a shorter top competition would have created two competitions of very different lengths. Some Sydney schools (one in particular I think) were already complaining about the travel, the impact of the bye plus the difficulties created where thirds teams were playing at a different venue. The shortening of the top comp accentuated these concerns.
One option would have been to exclude TAS, something that happened once before but which would have been very unfair. The end result was a somewhat messy interim solution. Newington took a a hit thus getting rid of the bye, while the number of TAS home games was reduced from two to one. The resulting competition is still longer than the abbreviated firsts/seconds comp.
I said interim solution. I don't think anybody knows what next year's firsts/seconds comp will look like. Decisions here will flow onto the thirds.
I may be wrong in my interpretation of all this, but it's the most rational explanation I have been able to come up with based on the public discussion.