Accordingly to how I see things now,
We have:
- total damage (strength + weapons & similar) vs total defence (character's armor value plus armors, helms and shields & similar) about damage dealing;
- dexterity vs. dexterity about hit or dodge.
In short, in order to hit a foe I need to have a dexterity score which is greater than his, including the roll from -5 to +5 that happens each time, not dexterity vs. the opponent's armor value.
To deal damge, do I need to have a total damage greater to the armor value, right?
So, let's assume that I can deal 30 damage to a foe that has armor 50 but I have such a dexterity that I always hit him. What does happen? Do I still deal some damage? Or I'm gonna to hit him but deal no damage, like trying to break an adjacent rock throwing mature tomatoes at it?
Sure hits, but no damage...
... anyway, you're close to correct with that. Basically (using your numbers of attacker with 30 damage and high dex vs. defender with 50 armor and low dex) on a roll of -5 thru 3 you will hit but do no damage. On a roll of 4 or 5 you bypass armor and do full 30 damage. (Please note that the 5 would hit at full damage regardless of dex, while 4 only did damage if you score a hit determined by dex)
