The players will be able to request any competition they deem is necessary. If they are arm wrestling, they may go with a ST vs ST competition in which both roll. If one character is lying, the other may roll for an OB vs LY. If there is something really zaney going on and they can think of a way Lying and Speed would need to compete, they can do that.
The command would be:
+compete speed [Player 2] speed
Thus, a competition of ones own speed against player 2s speed. Giving the result to both.
1 = Bad
2 = Poor
3 = Weak
4 = Mediocre
5 = Average
6 = Amateur
7 = Good
8 = Great
9 = Excellent
Alternatively:
1-3 = Average
4-6 = Good
7-9 = Excellent
This provides a "range of mystery" (tm) that means that adjectives are not just substituted for numbers.