100% sure.

[nelyak]

In our association we are taught to go with the appeal HOWEVER, in the original question PU was 100% sure and we are taught that if that is the case we remove our mask and ask for help and that is our signal not to over rule.

A very good point is made in that if the PU thinks swing is checked, and BU thinks she went, add in an ump at 2nd and 3rd you may have a vote of 1-3, 3-1, 2-2, or 4-0, or 0-4 for checked swing. So what is really getting it right? It boils down to judgement, if you are 100% sure don't be overruled but ask for courtesy.