> Rockn1 seems to be a larger 2001 game that was removed from MAME.
>
> Rockn seems to be a smaller, earlier game in the series (?).
>
> Why does CMP want to rename 'rockn1' to 'rockn'?


Size doesn't matter at all ;)

ClrMamePro wants to rename it because the files in the archive match the ones in rockn at most. That doesn't mean that rockn is the correct set though. It's just that way: you have an unknown set, now cmpro looks at the files in it (crc32, size check) and checks which existing set matches most.


Roman Scherzer
ClrMamePro