Good point Mary, I was only referring to the case mentioned, but the complete Dave Perry synopsis is more like this:

Same-tack overlap: inside has to make a seaman-like rounding

Opposite-tack overlap, Port inside (such as when rounding to starboard): Port has to make a seaman-like rounding

Opposite-tack overlap, Starboard inside (such as when rounding to port): Starboard has the right to make a tactical rounding

I still don't see how it's practical for a spin boat to be smoking into the mark within two hull lengths and expect to have a decent rounding, I don't think the rules account for the boat speeds of cats, especially spin cats.

Mike