+1 said above. Sanctioned cooks; cook to the sanctioning bodies' standard. FYI: across them, there are many differing standards; KCBS is certainly one of them...
I'd have it perfectly tender and right to the point of falling off the bone, but not. That's very similar to MBN's "pull cleanly from the bone with only slight resistance" definition, by the way...
Hance - Lake Dogs Cooking Team - MiM/MBN/GBA CBJ and comp cook
Lake Sinclair, GA (strategically about an hour from everywhere)