Sandlot Baseball Rulebook :p

Anything like Calvinball rules?

So, a runner rounding 3rd as the throw goes to the catcher and the moment s/he stops or reverses direction, the "run down" as started?

Wouldn't that mean there would always be a rundown every time a runner rounded a base and stopped and a fielder within throwing distance had possession of the ball?

I understand what you are saying. Definition needs to be tweeked a little. Better?

A rundown begins when a runner stops their advance to a base because fielder with possession of the ball is between the runner and the base the runner was advancing to and a play is attempted on the runner.

You don't understand what he's saying.

The fact that YOU have determined your own personal definition of rundown is completely irrelevant. (Your definition doesn't match mine, btw).

NSA has put a term in the rulebook that has a bearing on how obstruction is ruled, and then completely failed to define it. THAT is what he's saying.

I understand.