current chances of landing an arrow:
5+ Orcs, Goblins: 33.3%
4+ Humans, Uruk Hai: 50%
3+ Elves, Rangers: 66.7%
2+ Elf King: 83.3%

D20 shooting:
14+ Orcs, Goblins: 35% - a little needed boost
11+ Humans, Uruk-hai: 50%
8+ Elves, Rangers: 65% - slight nerf
5+ Elf King: 80% - still reliable

this might be worth it if you want to use modifiers when shooting. maybe:
+2 against monsters (large targets)
+2 if 4" or higher than target
-2 if moved this turn. (10% penalty vs current 16.7%)

you could also add "in the way" penalties for non-living cover to the D20 roll and not have to roll another die. this would be unfair to goblins though.

please let me know if i messed up the math.

thanks
-z

Didn't notice any errors in the math just wanted to say I liked the idea of the modifier for striking monsters I may use that idea in a scenario sometime. And personally I like the idea of adding to the range with a large elevation difference as opposed to accuracy

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what you could do to get a little more range is measure distance directly out from the elevated archer, parallel to the ground until you are right over your target. this will give them a slight range advantage over the ground archers measuring distance diagonally to the elevated archer.

Isn't D20 a bit overkill
Most skirmish games use D10s as the golden middleground between the D6 of larger wargames and the D20s of roleplaying.

I do like the idea.
But D20 is a dice most people don't have,
or do not have in bulk.

And you throw 1 dice?
Or you throw twice?