quote:
Single counts, RBI's count. If there were two outs at the time, the runs would be unearned as the error would have been the 3rd out. Less than two outs, runs are earned.
I don't think this is quite right. I think you reconstruct the inning without the error(s) to determine which runs are earned (rule 10.16). In this case assume that the dropped foul would be out number two. If the next batter K's, then the runs are unearned since the runners would never had advanced without the error. If the next batter hits an HR, then all the runs would be earned since the runners that scored on the previous hit would have scored on the HR....
But it is always a hit and the RBI's count for the batter that benefited from the error...