Players with better than -2.0 can enter any system
* -2.0 or worse cannot enter 1.0
* -2.5 or worse cannot enter 0.9
* -3.0 or worse cannot enter 0.8
* -3.5 or worse cannot enter 0.7
* -4.0 or worse cannot enter 0.6
* -4.5 or worse cannot enter 0.5