Is this meant to be a golfing kata? The description is extremely unclear as to what is expected here.

No random tests.

So, can you write the solution for ares without using the 'odds' array?

If this is supposed to be the meaning of the kata, it is not tested.

=> Great important note : Ares is a one-liner.

Also, if this is so important, one would think this should also be tested.

Without these conditions, this kata would otherwise appear to be a duplicate. Although I don't have time to search for it, I remember a kata with an array of values meant to be handled based on an array of indices.