With Marc Miller's T5 system there is a pretty simple way to convert to roll high system.Originally posted by Aramis:
Roll D100 +27, break 100. Simple. Taken straight from rolemaster.
a few points on the overall discussion:
1) roll under does not always mean "Flat distribution" rolling (EG: Hero System uses a roll-under, rolling on 3d6)
2) Successful multi-dice task systems have been dice based upon character abilities, not dice based upon difficulty. Of the latter, only two marginally succesfull ones come to mind: Tales from the Floating Vagabond, and Alternity.
3) Psychology of the players tends to be more in favor of roll high systems. (TSR did a survey on that...)
4) Most linear Roll low systems can be converted to roll high systems by a break x, roll dice and add skill
For example, converting TNE to a Roll high:
Target 21+ to succeed. Roll 1d20 + Asset. Crit is 31+.
VERY simple.
If that is your major concern..
I have mentioned it before.
Currently, you have a Formidable task = 3D6 based on Intelligence (10) and Steward (4). That translates out in the roll down to
(Int+Steward) > 3D6
That means to have to roll under a 14 on a 3D6 to succeed.
How do you translate that to a roll-high?
The max of a 3D6 or 3x6 = 18.
Your constant (Int+Steward) = 14.
Take away the constant from the max possible number possible from the die difficulty.
18 - 14 = 4
Roll over a 4 on a 3D6 for the roll high.
My problem is that it does not feel the same as a MT or CT+DGP system.
The reliance on attrbutes is still too high even with the "This is Hard" rules.