Those are at the left of the keyboard. I was wondering if you are left-handed ?
Nah, i just find it easier to have lot of control groups for units later in the game for easier army spreads etc (up to like 4 or 5 control groups when i have 200/200), so having nexii/robo's on somewhere between 1 to 5 kinda hinders me, so I have them over the right hand side.
Also the fact that it's pretty habitual from broodwar to do 0p for probe production.
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