So, Pathfinder doesn't have rope use like 3.5 (at least, as far as I can tell) if you want to tie someone up as a prisoner. The Core Rulebook has a section on "Tie Up" described this way:
Tie Up: If you have your target pinned, otherwise
restrained, or unconscious, you can use rope to tie him up.
This works like a pin effect, but the DC to escape the bonds
is equal to 20 + your Combat Maneuver Bonus (instead
of your CMD). The ropes do not need to make a check
every round to maintain the pin. If you are grappling the
target, you can attempt to tie him up in ropes, but doing
so requires a combat maneuver check at a –10 penalty. If
the DC to escape from these bindings is higher than 20 +
the target’s CMB, the target cannot escape from the bonds,
even with a natural 20 on the check.
So, from my reading, it would work like this: If the target is unconscious or not resisting, he or she is automatically tied up, no check is necessary. And no matter how skilled or unskilled the person tying them up is at using ropes, the DC to escape is related only to the Combat Maneuver Bonus of the person doing the tying up.
However, if the target is conscious, you would have to make a CMB vs CMD roll like any other grapple check.
Is this a correct reading of the rule?
And, if so, why would how good you are at grappling affect how good you are at tying an unconscious person up?
