[greymule]

Maybe only live action outs on following runners remove forces on preceding runners who miss bases. If that is so, then my example (and the BRD's) would be correct, and so would the case play UmpTTS43 offered from the meeting. Both plays involve an out on the BR before the appeal on a missed 2B by the preceding R1. After the live action out on the BR, the miss of 2B is a force play; after an appeal out on the BR, the miss of 2B is not a force play.

[Is live action NCAA's term for continuous action? Aren't all appeals in NCAA during "live" action?]

Now why successful appeals on missed bases by following runners would remove forces on preceding runners, but simple putouts would not remove forces is anybody's guess.

This brings up a question:

R3, R1, one out. Batter gets a hit down the RF line. R3 scores, R1 misses 2B and proceeds to 3B. The BR misses 1B and is tagged out trying for 2B (making 2 outs).

If the live action out on the BR does not remove the force at 2B, then a simple appeal of R1's miss nullifies R3's run.

But if the out on the BR does remove the force at 2B, then even after an appeal of R1, R3's run still counts. So the defense would then have to appeal the BR's miss of 1B for the advantageous 4th out.