[xXOpkillerXx]

Originally Posted by leonid

Does it also address the fact that difficulty differs based on what your goal is? Charts can be trivial to AA but impossible to AAA, or there's some stupid minefield that makes it really hard to pass but once you survive it's a guaranteed AA, etc

Right now I'm focusing solely on FFR. Since we use AAA equivalency, most of the difficulty will come from max values and length/stamina factors.

EDIT:
@leonid: stepmania is different obviously. What you describe as difficulty to AA, AAA, pass, are all very distinct values that may have a similar computing process but would have their own specific primitives. You can't possibly have a single metric for overall difficulty when your definition of difficulty is an undefined combination of 3 distinct aspects, otherwise you end up with obviously biaised results that are very hard to interpret. A fair comparison can be made with Etterna's calculator: if overall difficulty is some aggregate (like avg or weighted avg) of the per-pattern difficulties (jack, stream, js, etc), then it's not a surprise that they haveso many files to ban from leaderboards.