Superior position is between combatants. If the position of one combatant gives them a functional advantage over the other, the advantaged gets a
+1 bonus to the combat roll. (FUG 43)
Examples:
- Elevated position.
- Fighting from cover.
- Swordfighting from horseback.
- Standing over a prone person.
- A prepared sniper post.
Only in the most extreme circumstances can you ever net more than +1 from this.
This bonus would certainly apply in cases where your position is such that the other person cannot attack you, but you can attack them (a ranged weapon vs. a knife at distance).
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Combat Rules,
Combat Modifiers