[DG]

I call the obstruction and then wait to see what happens. Example, runner is obstructed going toward 3B while ball is in LF, I give the signal and wait to see what happens. The runner is thrown out by F7 at the plate on a close play. In my judgement he is awarded home because absent the obstruction going to 3B he would have been safe. If he was thrown out easily I have nothing, he runs at his own risk past the awarded base (3rd).

I don't like advancing a runner on a type B, when the runner would not have advanced, but that's the FED rule interpretation, although they don't recognize different types of obstruction.

There are several FED rules I don't like, but I call 'em, and I don't let the penalty cloud my thinking.