[AtlUmpSteve]

Originally Posted by teebob21

-- No one on. Base hit to the infield. The runner beats the throw but uses the white portion of the bag. The defense must appeal this. If, at the time of the appeal, the runner has already returned to 1B, the BR is safe.

-- Bases loaded, 1 out. Ball hit to F9 who throws to F3 for a force out at 1B. R1 advances to 3B but misses 2B. R2 and R3 score. When the defense appeals the missed base, the force is no longer in effect at the time of the appeal (although it was in effect at the time of the infraction). R1 may be called out for the third out of the inning, but both runs score.

Your second example should not call the play to F3 a force out at 1B; it is impossible to have a force out at 1B. That said, it is another example of the force being removed at 2nd.