Yep figured it out. I took the original code, split it up into ratios, and then divided by 1000 since that is what the roll of N is for - giving the percentage of the chance that we would pass the first roll, given that, when you go the second roll, there is the curve modifier that checks to see if you win the roll based on the 190 artificial modifier.
So, more or less, my formula in the spreadsheet is that exact post bubbled down into some crappy algebra. It isn't pretty, but the curves it produces seem fine to me. (pun intended).
Whether or not that is P1999 implementation, who knows?
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