Here is the REVISED RPS-9 chart... As you can see this version is much simpler. To check a pairing, all you do is choose BOTH on the left-hand side (LHS) and see which ones are matches.
Example #1: Gnomes vs. Dwarves.
Gnomes attack Dwarves, Dwarves attack Gnomes. So this is a 1:1 relationship!
Example #2: Orcs vs. Dark Elves.
Orcs attack Dark Elves. So this is a 1:0 relationship!
It's a SIMPLE as that!