[greymule]

Here's a somewhat similar play that NCAA calls differently from OBR and Fed:

R3, R1, 1 out. Batter hits a hard one-hopper to F3, who steps on 1B for the second out. R3 scores. F3 throws to 2B for the tag play on R1, but the ball goes into the outfield. R1 then misses 2B and advances to 3B. The defense successfully appeals the miss of 2B for the third out.

In OBR and Fed, the third out is not considered a force play, because the out on the BR at 1B removed the force play on R1. Therefore, R3's run counts. However, in NCAA, R3's run is nullified, because regardless of the out at 1B, R1 was forced at 2B when the play began.

Note that in NCAA, if R1 is simply tagged out trying to advance to 2B, the run counts. But if R1 misses 2B and is subsequently out on appeal, the run does not count.