Obstruction or nothing

[Rich]

Originally Posted by Manny A

You need to reread the definition of Obstruction.

There's only one reason why a BR would round first base, and that's to possibly advance to second. Otherwise, they would just overrun the bag or stop on top of it. If the BR is hindered while rounding, that's Obstruction, plain and simple.

A runner rounding first is frequently slowing down. He brushes a fielder while slowing, that's nothing, regardless of the rules set.