Wind up and Stretch (Set) Positions?

Tele

New member
Is it illegal or against baseball rules to pitch from the Windup position with runner(s) on first, second or first and second?

I know I've seen pitchers switch to windup when the bases are loaded and if there is a runner on third. I was wondering if there is a rule about this. I've never seen anyone pitch from Windup with a runner on first or first and second.
 
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