The 2008 FED Rule book says, page 23, under definition of obstruction, Rule 2-22 ART 3, "The fielder without possession of the ball denies access to the base the runner is attempting to achieve." That quoted part is the new part of the definition.
The 2008 Case book offers a play at the plate where the catcher blocks the plate prior to gaining possession of the ball, and calls it obstruction if the catcher "denied access to the plate prior to securely possessing the ball."
The actual penalty for obstruction has not changed from previous years.
I'm confident the FED will offer several more interps of the "train wreck" plays that can happen at first base as well as at home plate.
JJ
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