[Dakota]

Here's my view/opinion...

Speaking ASA...
Rule 1 – INTERFERENCE uses the phrase “attempting to execute a play.”
8-8-J-1 “attempting to field a batted ball”
8-8-J-3 “attempting to throw the ball”
8-8-J-4 “intentionally with a thrown ball”
8-8-Q “defensive player has the ball”
POE 13-A “fielder holding the ball”
POE 13-D “fielder holding the ball”
POE 31 “attempting to execute a play”, and “defensive players must be given the opportunity to field the ball anywhere on the playing field or throw the ball without being hindered”

I don’t think the standard is different. The runner nearly always must yield to a fielder with the ball, attempting a play, attempting to field a batted ball, or about to receive a thrown ball.

A slide will prevent a crash interference ruling as long as it is a slide intended to make contact with the base. The “take out” slide is illegal if the player is sliding with the obvious intent to interfere with the play – for example, a cleats-high slide. The MLB “take out” slide is illegal in ASA, and unsportsmanlike conduct if flagrant. However, contact with the fielder during a legal slide is not interference, even if it prevents a further play by the fielder. Again, you’ll know it when you see it.

In your situation of the player standing on the base, unless the runner did something intentional to interfere (wave arms, bob-and-weave to stay in the way, etc) then the fielder has to move from behind the runner.