[CoachPaul]

If the runner is sliding straight into the bag he has every right to try to beat the force. If the runner beats the ball, the fielder should lift his foot, just like if he was waiting for a feed from another infielder. Just like a catcher can't deny access to the plate without the ball in his possession, a fielder can't deny access to the base without possession. If the runner is simply trying for the base, I don't have interference on the play. If the 2B was camped in the baseline to the right of the bag and was waiting for a slow roller to come to him in an obvious attempt to alter the runner's path, I might have obstruction. He's not 'making an attempt' on the ball. There is a big difference between pausing to field a grounder and hanging out waiting for it. I'd still expect the runner to avoid contact in this example. If the fielder's action resulted in enough alteration of the runner's path, I would award the base.