The chief reason I decided to go with a single special/critical mechanic at 10% was that it can be determined without math calculation at all:
A d100 roll that ends in a '0' and succeeds is a special success.
A d100 roll that ends in a '0' and fails is a special failure.
Although I completely agree that the 5% or 20% calculation isn't too difficult to determine on the fly (no chart needed), I really like the game design elegance of the "roll ending in '0'" simplicity.
If you want to retain the 20% rate, just rule that any roll that ends in a '0' or a '5' is a special result. (This is how Harnmaster works, btw, and it's the system from which I stole the idea...). I've never been a fan of the "super success" rule (i.e. criticals), but that's just me.
I think a single grain at 10% splits the difference between two at 5% and 20% just fine in game play.
Last edited by McBard; October 24th, 2007 at 13:48.
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