+60/-60 is the maximum allowed positive or negative value to a test.
So if you have a total of +90 to a test, and -20 to the test, you would be at +70, reduced down to +60.
Same goes for negatives so -70 to acquire a Unique item, and you have no bonus, its -60 effective. It starts at -70 because you can get many positive modifiers.
Wait. Doesn't this mean that acquiring a good-craftsmanship unique item would have the same difficulty as acquiring a common-craftsmanship one? And acquiring 1 of them would have the same difficulty as acquiring 2?
Yes mechanics wise it does, but this is where I'd expect the GM to say ..sorry you were unsuccessful.. if the person attempting it has a 01 roll to make to succeed.
Edited by Balenorn, 19 November 2013 - 05:49 AM.