Thels, /var should use = when being set and there's no reason to use $calc to increment a variable. Use /inc %chancount, or if you really want to use +1, then just put /var %chancount = %chancount + 1. It doesn't need $calc.
Doesn't inc make something a global variable?
As for the =, that's just whatever style you prefer. In some cases (such as when you use [ $+ [ ] ] for arrays), you can't even use =.
